What is unique about electromagnetic waves? Name several examples
Answers
Electromagnetic waves are unique because they are the only type of wave that can travel through a vacuum, such as space, without the need for a medium. There are many examples of electromagnetic waves, ranging from radio waves to gamma rays.
They are also transverse waves, which means that the oscillations of the wave are perpendicular to the direction of the wave's motion. Radio waves have the longest wavelength and are used in communication technology, such as radio and television broadcasting. Microwaves have a shorter wavelength and are used in microwave ovens and communication devices such as cell phones. Infrared waves are used in remote controls and thermal imaging. Visible light is the part of the electromagnetic spectrum that we can see and is responsible for all the colors we see around us. Ultraviolet waves can cause skin damage and are used in black lights. X-rays and gamma rays have the shortest wavelength and are used in medical imaging and cancer treatments. Overall, the unique properties of electromagnetic waves make them incredibly versatile and useful in a variety of applications in everyday life.
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Related Questions
The magnitude of the resultant of two vectors of magnitude 3 units and 4 units is 5 units. What is the angle between two vectors?
Answers
Explanation:
Using Cosine rule, we have 5² = 3² + 4² - 2(3)(4)(cosx).
=> cosx = 0, x = 90°.
A Heater Is Rated At 1200 W. How Much Current I Does It Draw When It Is Connected To A 120-V Voltage Source?
Answers
Current it draws when it is connected to a 120-V Voltage Source is calculated as 10A.
What is meant by power?Electric power (P) of any appliance is defined as the product of the voltage applied on it (V) and the current that flows in it (I).
The rate at which work is done or energy is transferred in an electrical circuit is called electric power or we can also say that it is a measure of how much energy is used in a span of time.
Therefore, P=I*V.
We need to calculate the current and we have the power and the voltage.
Given a heater rated at 1200 W and connected to 120 V voltage source will draw a current of 1200 W / 120 V = 10 A.
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An element of atomic number 88 decays radioactively to anelement of atomic number 82.Which of the following emissions achieve this result?a.one alpha particle and one beta particleb. three alpha particlesc. one alpha particled. six beta particles
Answers
Three alpha particles are lost.
The process by which unstable nuclei emit radiation and lose energy is called radioactive decay. If a material contains an unstable core, it is considered radioactive.
There are three basic types of radioactive decay, Decay of alpha, beta and gamma. Radioactivity can be measured by counting decays per second.
Explanation:
Six protons are lost when atomic number 88 decays to atomic number 82.
The following explains whether the radioactive decay process leads to the loss of six protons.
1. One Alpha and one beta particles: Alpha particles have two protons and beta particles have one electron. So this is not a loss of 6 protons.
2. Three alpha particles: Alpha particles have two protons. So when 3 alpha particles decay, 6 protons are lost.
3. One Alpha particle: An alpha particle has two protons, so six protons are never lost.
4. Six Beta Particles: A beta particle has 1 electron, therefore 6 protons will be gained during the decay.
Therefore, three alpha particles is correct because when three of them are lost, six protons are lost.
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Calculate the range of wavelengths (in m) for X-rays given their frequency range is 30,000 to 3.0 ✕ 107 THz.
Smaller Value ___________ m
Larger Value ____________ m
Do the same for the visible light frequency range of 380 to 760 THz.
Smaller Value ___________ m
Larger Value ____________ m
Answers
The range of wavelengths (in m) for X-rays given their frequency range is 30,000 to 3.0 ✕ 107 THz.
Smaller Value 1*10^4m
Larger Value 10m
The range of wavelengths for the visible light frequency range of 380 to 760 THz.
Smaller Value 7.8*10^5m
Larger Value 3.9*10^5m
Define wavelength.
The distance over which the shape of a wave or periodic function repeats is its wavelength or spatial period. To put it another way, it is the separation between two neighbouring wave points that belong to the same phase, such as two adjacent crests, troughs, or zero crossings.
We know,
c = λ f
λ = c /f
for X-rays given their frequency range is 30,000 to 3.0 ✕ 107 THz
For f = 30,000
λ = 3 * 10⁸/ 30,000
λ= 1*10^4m
For f = 3.0 ✕ 107 THz
λ = 3 * 10^8/3.0 ✕ 10^7
λ = 10m
for the visible light frequency range of 380 to 760 THz.
λ= c/f
For f = 380
λ = 3 * 108/380 = 7.8*10^5m
For f = 760 THz
λ = 3 * 10⁸/ 760 = 3.9*10^5m
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Consider a series RLC circuit where R-15.0 Ω, C= 35.5 μF, and L-0.0940 H, driven at a frequency of 60o He. Determine the phase angle of tir. Number Your result above indicates which of the following holds? □ The voltage lags behind the current. The current lags the voltage. Overall, the system is capacitive. Overall, the system is inductive. □
Answers
Since the calculated phase angle is negative, the voltage lags behind the current. This indicates that the circuit is predominantly capacitive.
The phase angle of the circuit can be calculated using the formula:
tanφ = (Xl - Xc) / R
where Xl is the inductive reactance and Xc is the capacitive reactance.
Xl = ωL = 2πfL = 2π(60)(0.0940) = 35.35 Ω
Xc = 1 / (ωC) = 1 / [2π(60)(35.5 × 10^-6)] = 75.45 Ω
Substituting the values into the formula, we get:
tanφ = (35.35 - 75.45) / 15.0 = -2.67
Taking the arctangent of both sides gives:
φ = -68.9 degrees
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a step-down transformer is used for recharging the batteries of portable devices such as tape players. the turns ratio inside the transformer is 13:1 and is used with 120-v (rms) household service. if a particular tape player draws 0.35 a from the house outlet, what are (a) the voltage and (b) the current supplied from the transformer? (c) how much power is delivered?
Answers
We can use the transformer equation to solve this problem. The transformer equation states that the ratio of voltages is equal to the inverse of the turns ratio:
Vp / Vs = Ns / Np
where Vp is the primary voltage, Vs is the secondary voltage, Np is the number of turns in the primary coil, and Ns is the number of turns in the secondary coil.
(a) To find the voltage supplied from the transformer, we can use the transformer equation and solve for Vs:
Vs = Vp (Ns / Np)
The turns ratio is given as 13:1, which means that Ns / Np = 1 / 13. Therefore,
Vs = (120 V) (1 / 13)
Vs = 9.23 V
The voltage supplied from the transformer is 9.23 V (rms).
(b) To find the current supplied from the transformer, we can use the fact that power is conserved in a transformer. That is, the power delivered to the primary coil is equal to the power delivered to the secondary coil. Therefore,
Ip Vp = Is Vs
where Ip is the primary current, Is is the secondary current, and we have assumed ideal conditions with no losses. Rearranging this equation to solve for Is, we get:
Is = Ip (Vp / Vs)
The primary voltage is 120 V (rms). To find the primary current, we can use the fact that power is equal to voltage times current, or P = VI. The tape player draws 0.35 A from the house outlet, which means the power delivered to the primary coil is:
P = VI = (120 V) (0.35 A) = 42 W
Since the transformer is ideal and there are no losses, the power delivered to the secondary coil is also 42 W. Therefore, the current supplied from the transformer is:
Is = Ip (Vp / Vs) = (42 W) / (9.23 V)
Is = 4.55 A (rms)
The current supplied from the transformer is 4.55 A (rms).
(c) The power delivered to the tape player is equal to the power delivered to the secondary coil of the transformer, which is 42 W. Therefore, the power delivered to the tape player is 42 W.
Some question abt eclipses 20 points
Answers
Answer:
I believe they are all correct.
Explanation:
Hope that helps!
using your spectroscope, you observe a light source and see several strong, distinct lines. is this source continuous or discrete? given a line with a wavelength corresponding to 500 nm, calculate the energy of the emitted light.
Answers
With the aid of your spectroscope and E = (h*c)/wavelength, you can determine the energy of the emitted light to be 3.97 x 10-19.
What does a mean in terms of wavelength?mathematical representation The movement v (in the x direction), frequency f, and wavelength of traveling sinusoidal waves are frequently expressed mathematically as follows: where y is the value of the wave at any place x and time t, and A is the wave's amplitude.
What is the wavelength measurement unit?The symbol for the wavelength in the SI is typically m, or one metre. The multiples or fractions of something like a meter are also employed for measuring wavelength. Notably, when wavelengths are a significant attribute, exponential powers of 10 are employed. Shorter wavelengths are given as negative exponentials.
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The Sun is composed entirely of oxygen and helium.
True
False
(for astronomy)
Answers
Answer:
It's true.
And this makes the state of the sun to be "plasma"
Answer: It is False.
Explanation: I am on my final test for Astronomy. And I study really hard and I know its the right answer.
Which word fits in this sentence:
A __________ is how long it takes for one of the planets to go around the sun one time. Earth takes 365.25 days to go around the sun one time. We call this a _______.
A: revolution, year
B: year, revolution
Answers
Answer:
B because thats the answer
Which situation will produce the greatest change of momentum for a 1. O-kilogram cart?
(A) accelerating it from rest to 3. 0 m/s
(B) accelerating it from 2. 0 m/s to 4. 0 m/s (C) applying a net force of 5. 0 N for 2. 0 m/s
(D) applying a net force of 10. 0 N for 0,5 m/s
Answers
Applying a net force of 10.0 N for 0.5 m/s will produce the greatest change of momentum for a 1.0-kilogram cart.
The situation that produces the greatest change of momentum for a 1.0-kilogram cart is (D) applying a net force of 10.0 N for 0.5 m/s. This option results in the greatest change in momentum as it involves the greatest impulse. Impulse is the product of force and time or the change in momentum of an object. The impulse can be calculated using the formulaImpulse (J) = force (F) x time (t)or J = FtWhen a force is applied to an object, it creates a change in momentum. The greater the force or the longer the time of application of the force, the greater the change in momentum. A net force of 10.0 N is applied for 0.5 s. Therefore, the impulse generated is given by J = (10.0 N) x (0.5 s) = 5.0 Ns.Due to the impulse, the velocity of the cart will change from its initial velocity. As momentum is conserved, the change in momentum of the cart will be equal to the impulse applied to it.
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PLS ANSWER FAST WILL GIVE BRAINLY!!!
When you bounce a ball eventually it will stop bouncing. Where does the energy go?
Answers
Answer:
Into sound and heat energy due to friction.
Which condition causes a hurricane to rotate?
a local storm surge
the Coriolis effect
several large waves
severe coastal flooding
Answers
Answer:
b
Explanation:
The Coriolis effect is a condition which causes a hurricane to rotate in a particular direction. Thus, the correct option is B.
What is the Coriolis effect?Hurricanes are the enormous storms which come with a rotating wind speed of about 74 miles per hour. The rotating wind that swirls across the warm water of the tropics and also comes with a terrifying force.
The Coriolis force is an inertial or the fictitious force, which acts on the objects which are in motion within a frame of reference that rotates them with respect to an inertial frame. In a reference frame, with the clockwise rotation, the force acts to the left of the motion of the object. Whereas, in one with anticlockwise or counterclockwise rotation, the force acts to the right of the object. The deflection of an object due to this Coriolis force is called as the Coriolis effect.
Therefore, the correct option is B.
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ad the instructions.
To prepare safe, usable concrete, first inspect the molds. Then pour in the cement, having first mixed in the aggregate. Check to make sure
t the mixture contains 7% water, and let the concrete harden. When the curing process is over, test the concrete for elasticity. Inflexible concrete
kes a hazardous building material, so follow these directions carefully.
ich sentence best summarizes this paragraph?
O1. The preparation of cement has several stages.
O2. Adding too much water or aggregate to the curing concrete can create a hazardous building material.
3. Concrete must be carefully poured, mixed, cured, and tested to assure a safe building material.
4. First inspect the molds before beginning to pour concrete.
Answers
Concrete must be carefully poured, mixed, cured, and tested to assure a safe building material. Option three is the most suitable answer
What is cement ?A cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel together.
There are four stages in the manufacture of port land cement:
1) crushing and grinding the raw materials
2) blending the materials in the correct proportions
3) burning the prepared mix in a kiln
4) grinding the burned product, known as “clinker,” together with some 5 percent of gypsum (to control the time of set of the cement).
The three processes of manufacture are known as
a) wet
b) dry
c) semidry processes
So termed when the raw materials are ground wet and fed to the kiln as a slurry, ground dry and fed as a dry powder, or ground dry and then moistened to form nodules that are fed to the kiln.
The whole paragraph is a process that ensures formation of good quality cement and ensures formation of quality structures which are capable of withstanding time.
Therefore, Option three is the most suitable answer , Concrete must be carefully poured, mixed, cured, and tested to assure a safe building material.
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a rock is thrown from a bridge 20.5 m above water with an initial speed of 16.5 m/s. show answer no attempt assuming negligible air resistance, what is the speed that the rock hits the water with, in meters per second?
Answers
a rock is thrown from a bridge 20.5 m above water with an initial speed of 16.5 m/s. show answer no attempt assuming negligible air resistance, is the speed that the rock hits the water with, in meters per second is 27.8
Gravitational acceleration = g = 9.81 m/s2
Mass of the rock = m
Height from which the rock was thrown = H = 20.5 m
Initial speed of the rock = V1 = 16.5 m/s
Speed of the rock when it hits the water = V2
By conservation of energy the initial potential energy and the kinetic energy of the rock is equal to the final kinetic energy of the rock.
mgH + mV12/2 = mV22/2
gH + V12/2 = V22/2
(9.81)(20.5) + (16.5)2/2 = V22/2
V2 = 27.8 m/s
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How use of SI units in daily life is important .
Answers
Answer:
SI units are the physical units of measurement. SI units include kilogram, meter, second, ampere, kelvin, candela, and mole etcetera.
SI units are very important for daily life while measuring daily life commodities, such as:
Use of kilograms and grams while buying or selling sugar or other food items.Use of kilometers and meters while covering distances.Use of meters or inch by carpenters while estimating the lengths for furniture.Use of hours, seconds and minutes to measure time duration.Use of ampere and volt to measure current and voltage respectively by electricians.Without SI units, it would be difficult to meausre the amount of object required or any other measurement object.
Question 47 Marks: 1 Centrifugal pumps are of several types depending on the design of theChoose one answer. a. volute b. shaft c. impeller d. mechanical seal
Answers
Centrifugal pumps are of several types depending on the design of the impeller. Option C is the correct answer.
Centrifugal pumps are classified based on the design of their impeller, which is the rotating component of the pump that imparts velocity to the fluid being pumped.
The different types of centrifugal pumps include single-stage, multi-stage, axial flow, radial flow, and mixed flow pumps, each with a unique impeller design suited for specific applications.
The volute is the stationary casing that surrounds the impeller and converts the high-velocity fluid into the high-pressure fluid.
The shaft is the rotating component that connects the impeller to the motor. The mechanical seal is a component used to prevent fluid leakage along the shaft.
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It was once recorded that a Jaguar left skid marks that were 290 m in length. Assuming that the Jaguar had a constant acceleration of -3.9 m/s/s, determine the speed of the Jaguar before it began to skid to a stop.
Answers
Answer: 47.6 m/s
Explanation: Please see attached for the calculation and formula.
under which conditions do both convex and concave mirrors form virtual images state whether or not each can form a real image if the mirror can form a real image describe how this occurs
Answers
Answer:
Explanation:Concave mirrors can make a real image.when the object is away from the mirror it is called real image and when the object is closer to the mirror it is called virtual mirror.
Select all the correct answers.
An unmanned spacecraft leaves for Venus. Which statements about the spacecraft's journey are true?
O
The weight of the spacecraft keeps changing.
The mass of the spacecraft keeps changing.
The weight of the spacecraft remains the same.
The mass of the spacecraft remains the same.
The gravitational pull on the spacecraft remains the same.
Answers
An unmanned spacecraft leaves for Venus. The statements, The weight of the spacecraft keeps changing and The mass of the spacecraft remains the same. This 2 statements A and D are true.
What is Spacecraft ?A spaceship is a machine or vehicle built to travel through space. Spacecraft are a form of artificial satellite utilised for a wide range of tasks, such as communications, Earth observation, meteorology, navigation, space colonisation, planetary exploration, and freight and person transfer. All spacecraft, with the exception of single-stage-to-orbit vehicles, need a launch vehicle (carrier rocket) to get into space.
A spacecraft that is performing a sub-orbital spaceflight launches into space and then lands without gaining enough momentum or energy to complete a full orbit of the Earth. Spacecraft enter confined orbits around the Earth or other celestial bodies for orbital spaceflights. Only humans are carried on human spacecraft either as crew or guests from launch or while in orbit (space stations).
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Which current is produced in homes? magnetic voltage alternating direct
Answers
Answer:
Alternating
Explanation:
Edge 2020
Which circumstances could be sources of error within the experiment? Check all that apply.
not fully submerging the object when doing the fluid displacement procedure
water that is left behind in the collection container when it is transferred for measurement
water that soaks into the materials of the balls, affecting the mass in repeated trials
the time of day when the measurements are recorded
water in the bucket, approximated to the closest 10 mL due to surface tension at the top of the bucket
the air pressure in the room and its affect on the scales that measure the mass of each object
Answers
Answer:
-not fully submerging the object when doing the fluid displacement procedure
-water that is left behind in the collection container when it is transferred for measurement
-water that soaks into the materials of the balls, affecting the mass in repeated trials
-water in the bucket, approximated to the closest 10 mL due to surface tension at the top of the bucket
Answer:
A, B, C, E
Explanation:
At t = 0, a wheel rotating about a fixed axis at a constant angular acceleration of -0. 40 rad/s2 has an angular velocity of 1. 5 rad/s and an angular position of 2. 3 rad. What is the angular position of the wheel at t = 2. 0 s?.
Answers
The angular position of the wheel at t = 2. 0 s is 4.5 rad.
Angular Position:
When an object is undergoing a rotational motion, then the orientation of the object with respect to a specific reference position is known as angular position.
Given data:
The angular acceleration of the object at initial is, α = - 0.40 rad/s².
The angular velocity of the object is, ω = 1.5 rad/s.
The angular position of the object at initial is, \(\theta = 2.3 \;\rm rad\).
The time interval is, t = 2.0 s.
The expression for the angular position of the wheel at t = 2.0 s is,
\(\theta' = \theta+ \omega t + \dfrac{1}{2} \alpha t^{2}\)
Solving as,
\(\theta' = 2.3+ (1.5 \times 2) + \dfrac{1}{2} \times (-0.40) \times 2^{2}\\\\ \theta' = 4.5 \;\rm rad\)
Thus, we can conclude that the angular position of the wheel at t = 2. 0 s is 4.5 rad.
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2. A ball is dropped from a height of 52 m. The ball falls freely and reaches the ground in 75 s. What was the average speed of the ball?
Answers
Answer:
v = 0.69 m/s
Explanation:
Given that,
A ball is dropped from a height of 52 m.
The ball reaches the ground in 75 seconds
We need to find the average speed of the ball. The ball will travel a distance of 52 m in 75 s. The average speed of the ball is distance divided by time taken. So,
\(v=\dfrac{52\ m}{75\ s}\\\\v=0.69\ m/s\)
Hence, the average speed of the ball is 0.69 m/s.
A wave has a wavelength of 2 meters and a frequency of 1.5 hz. What is its speed
Answers
Answer:
3m/s is the answer.
Explanation:
f = c/λ
f = frequency
c = speed (m/s)
λ = wavelength
f = c/λ
1.5 = c/2
c = 3m/s
thermal energy is added to 4 identical samples of water.what increases in each example
Answers
CORRECT ANSWER GETS BRAINLIEST!!! (∩^o^)⊃━☆
Each of these simple machines work around a pivot point except the __________.
a.
lever
c.
wedge
b.
pulley
d.
wheel and axle
Answers
Answer:
C. Wedge
Explanation:
Answer:
GIVE THE PERSON ABOVE BRAINLIEST UwU
Explanation:
Nikolas, the fire extinguisher, and the skateboard have a combined mass of 50 kg. What force would the fire extinguisher have to produce to propel Nikolas if he wanted to accelerate at a rate of 1.2 m/s2? Round your answer to the nearest whole newton.
Answers
Answer:
60N
Explanation:
Given parameters:
Combined mass = 50kg
Acceleration = 1.2m/s²
Unknown:
Force to propel = ?
Solution:
From Newton's second law of motion, we know that;
Force = mass x acceleration
So;
Force = 50 x 1.2 = 60N
Answer:
60N
Explanation:
what force is responsible for the motion along the boundary between the nazca and south american plates?
Answers
B. Slab pull is force responsible for the motion along the boundary between the nazca and south american plates.
Slab Pull: What is it?A cold, solid oceanic plate that is being dragged into the mantle by its own weight is characterized as a slab. Based on the argument, the oceanic plate sinks into the mantle because it has a greater density than the hotter mantle underneath it.
What kind of plate barrier exists between the South American Plate and the Nazca Plate?Examples of ocean-continent convergent borders also include subduction of the Juan de Fuca Plate under North America and the subduction of the Nazca Plate under South America, which led to the formation of the Andes Mountains and the Peru Trench (creating the Cascade Range).
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what force is responsible for the motion along the boundary between the nazca and south american plates?
A) Ridge push
B) Slab pull
C) Rising hot mantle
Determine whether each statement describes a solid, liquid, or gas
Answers
Answer:
1.solid
2.gas
3.liquid
4.liquid and gas
5.gas
6.liquid
7.gas
8.liquid and gas