a. leds cannot be made of silicon because silicon has a smaller band gap compared to gaas. b. gaas has a larger band-gap compared to silicon therefore it can absorb a larger portion of the sunlight energy. c. by adding impurities that facilitate and accelerate carrier recombination, solar cell efficiencies can be improved. . removed! m. work function of aluminum is smaller than the distance between conduction band of silicon and vacuum level, therefore, aluminum contacts with n-type silicon result in schottkey junctions.

Answer:

B

Explanation:

for the motion every night, it is because the Earth spins on its axis.

for the changes over a year, this is because the Earth rotates around the sun.

for the changes over hundreds, thousands or millions of years, this is because the whole solar system (including the Earth, of course) rotates with all the other stars in our galaxy around the center of the galaxy. and each star system has its own orbit (similar to the planets in our solar system).

it is very rare to see objects outside of our galaxy without a telescope, but they change too over a long period of time, because our galaxy not only rotates by also moves through the universe, and these other objects move on their own too.

Answer:

b earth spins on its axis

Explanation:

The mass of the object is 5 kg when a net force of 15 n is applied to the object.

By using Newton's second law of motion we find the mass of the object. The equation for Newton's second law of motion is:

F=ma

where F is the net force, m is the mass of the object, and a is the acceleration of the object.

Given that the net force is 15 N and the acceleration is 3 m/sec2.

So by using the equation we can solve for the mass:

\(m = \frac{F}{a}\) = 15 N / (3 m/sec2) = 5 kg

The mass of the object is 5 kg.

Newton's second law states that the net force acting on an object is directly proportional to its mass and acceleration. If the net force on an object increases, its acceleration will increase proportionally.

If the mass of an object increases, its acceleration will decrease proportionally.

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In the case of starlight passing through a cloud of hydrogen atoms, the dominant cause for line broadening is ________.

In the case of a laser beam passing through a methane cell, the largest line broadening effect is due to ________.

In the case of starlight passing through a cloud of hydrogen atoms, the dominant cause for line broadening depends on the given parameters. The natural line width (AwN) is primarily determined by the lifetime of the excited state, which is given as to. The Doppler width (Awp) is influenced by the temperature (T) and the mass of the particles. The collision width (Awc) is influenced by the collision cross section and the particle density (n). To determine the dominant cause, we need to compare these factors and assess which one contributes the most significantly to the line broadening.

In the case of a laser beam passing through a methane cell, the line broadening is affected by different factors. The natural line width (AwN) is related to the energy-level structure and transition probabilities of the absorbing molecules. The Doppler width (Awp) is influenced by the temperature (T) and the velocity distribution of the molecules. The flight time width (AwFT) is determined by the transit time of the molecules across the laser beam. To identify the largest contributor to line broadening, we need to evaluate these effects and determine which one has the most substantial impact on the broadening of the spectral line.

the dominant cause of line broadening in starlight passing through a cloud of hydrogen atoms and in a laser beam passing through a methane cell depends on various factors such as temperature, particle density, collision cross section, and energy-level structure. To determine the dominant cause and the largest contributor, a thorough analysis of these factors is required.

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When a mixture first reaches its boiling point, the component that transitions to vapor first is the one with the lower boiling point. This is because the molecules of the component with the lower boiling point have weaker intermolecular forces, so they require less energy to break away from the liquid and become a gas.

The component with the higher boiling point will require more energy to transition to vapor, as its intermolecular forces are stronger. Molecular weight and density do not play a significant role in determining which component will transition to vapor first. It is important to note that as the boiling process continues, more and more of the components will transition to vapor until all of the liquid has become a gas.
When a mixture first reaches its boiling point, the component that transitions to vapor first is b) The component with the lower boiling point. This is because, in a mixture, each component has its own boiling point, and when the temperature reaches the lowest boiling point among the components, that particular substance starts to vaporize. As the temperature increases further, other components with higher boiling points will also begin to vaporize. The boiling point of a component is mainly determined by its molecular structure and intermolecular forces, rather than its molecular weight or density.

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The speed of Olivia when she made it to the bottom of the hill is 14m/s.

Kinematics is the study of mechanical points, bodies, and systems in motion without taking into account the forces acting on them or the corresponding physical qualities.

Kinematics equations of motion define the fundamentals of an object's motion, such as its position, velocity, or acceleration over time. These three equations of motion control how an item moves in one, two, and three dimensions.

Kinetics considers physical forces as well as material characteristics such as mass stiffness and tensile or compressive strength. These characteristics can be used to take a theoretical model from kinematics and use physics and thermodynamics to determine how to construct a workable, dependable, and functional real-world system.

Given,

Initial velocity, u = 4m/s

Acceleration, a = 2m/s-2

Displacement, s= 45m

we know that,

\(v^{2}= u^{2} + 2as\), where v= final velocity

substituting the value in the above equation, we got

\(v^{2}\) = \(4^{2} + 2(2)(45)\)

v = \(\sqrt{196}\)

v = 14 m/s

Thus, the speed of Olivia going down the hill is 14m/s.

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The given amplifier circuit is a common-source amplifier. The equivalent circuit diagram of the amplifier includes a MOSFET N5486 transistor. We can determine the drain current (ID) and drain-source voltage (VDS) using the following equations:

1. Voltage at the source terminal (VS) is calculated using Ohm's law: VS = IS x RS.2. The drain current (ID) can be calculated using the equation ID = IS (1 + GVin), where Vin is the input voltage, G is the voltage gain, and IS is the current flowing through RD.Let's calculate the values of ID and VDS:

Given:- IS = VDD / RD = 10V / 10Ω = 1A- Vin = -1V / (1.5 x 10^6Ω + 0.47μF) = -0.6666667μA (using voltage divider rule)- G = -RD / RS = -10Ω / 3kΩ = -0.003333 Calculating ID:ID = 1A (1 - 0.003333 x 0.6666667 x 10^6)≈ 0.997A = 997mACalculating VDS:VDS = VDD - IDRD= 10V - 997mA x 10Ω≈ 10V - 9.97V≈ 0.03VTherefore, the values of ID and VDS are approximately ID = 997mA and VDS ≈ 0.03V, respectively.

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Answer:

Also, you could do this for the groups:

Group 1- creatures with scales

Group 2- creatures with fur

Group 3- creatures with feathers

For 4 groups you could possible do:

Group 1- no legs

Group 2- 2 legs with wings

Group 3- 2 legs without wings

Group 4- 4 legs

Answer:

15 units NE

Explanation:

Assuming the coordinate plane is a compass with N being the positive y-axis, we can use the Pythagorean theorem to find the magnitude of the vector. Since the vector is going up by 12 and right by 9 at the same time, it should form a diagonal line, aka the hypotenuse of a triangle. This triangle has both of its leg units as 12, and 9. Pythagorean theorem states that a^2 + b^2 = c^2, that is both of their legs squared is the hypotenuse of the triangle squared. 12^2 + 9^2 = c^2. c = 15. Now that we know the magnitude, let's go back to the quadrants as the compass. Since both units are positive, the vector goes in the positive direction on both sides, which is Quadrant 1. North and East would be the appropriate say for the vector's direction, thus the vector's direction will be 15 units North East.

At the coordinates (2, 4), the unit vector (I + 4j)/17 is parallel to the line tangent to the parabola

y = x2.

The resultant vector of A and B is the sum of vectors A and B. Hence this is the unit vector parallel to the resultant vector AB

Vectors with a magnitude of exactly one unit are known as unit vectors. For a variety of reasons, they are really helpful. Specifically, any other vector can be formed by combining the unit vectors [0,1] and [1,0].

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Then using green light would be the optimal choice for minimizing the distance between interference maxima on a screen.

If the goal is to minimize the distance between interference maxima on a screen, a green light source would be the best option. This is because green light has a wavelength of about 500-550 nanometers, which is in the middle of the visible spectrum.

Green light has the ability to diffract through a narrow slit, producing a central bright spot with adjacent dark and bright fringes on either side. The distance between these fringes is directly related to the wavelength of the light used.

Since green light has a shorter wavelength than red light and longer than blue light, it creates a smaller distance between the interference maxima.

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Answer:

a. Your mass with the basketball is 55.5 kg

b. Your new velocity is 0.045 m/s

Explanation:

We first add your weight and the basketballs weight to get 55.5 kg.

Then to find b. we use the equation: v final = (m1 * v1) / (m1 +m2)

So m1 is the basketball which is 0.5 kg and v1 is 5 m/s. So the top half is (0.5 * 5)

The bottom half is just our weights added together.

Answer:

a) 55.5 kg

b) .045 m/s

Explanation:

Using conservation of momentum, we can set the initial momentum of the skateboard-person-basketball system equal to the final momentum of the skateboard-person-basketball system.

m1 = skateboard + person = 55 kg

m2 = basketball = .50 kg

v1_i = 0 m/s

v2_i = 5 m/s

Solve for v_f (same as v1_f or v2_f since the system is moving together -- assuming perfectly inelastic collision).

m1v1_i + m2v2_i = m1v1_f + m2v2_f

m1v1_i + m2v2_i = v_f (m1 + m2)

Substitute known values into the equation.

(55)(0) + (.5)(5) = v_f (55 + .5)

2.5 = v_f (55.5)

v_f = .045 m/s

Your new velocity after catching the basketball is .045 m/s.

The direction of velocity is 81.12°

Given that,

Since it is a right angled triangle,

tan θ = Opposite side / Adjacent side

tan θ = Total vertical velocity/ Total horizontal velocity

tan θ = 7714.9 / 1204.9 = 6.4

θ = \(tan^{-1}\) ( 6.4 )

θ = 81.12 °

Therefore, the direction of its velocity is 81.12° with respect to x - axis.

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Answer:

A

Explanation:

Answer:

Answer A-93

Explanation:

Given data

*The weight of the box is W = 500 N

*The distance of the plank from the fulcrum is d = 5 m

*The given force at a distance from the fulcrum is D = 10 m

The minimum force is required to lift the box is given by the net torque as

Substitute the known values in the above expression as

Hence, the minimum force is required to lift the box is F = 250 N

Answer:true

Explanation:

The potential energy for the child as she is released is 82.1 J, she will be moving at a speed of 4.01 m/s at the bottom of the swing, and the work done by the tension in the ropes as the child swings from the initial position to the bottom is 193 J.

A 24.0 kg child is playing on a swing having support ropes that are 1.80 m long. A friend pulls her back until the ropes are 45.0 degree from the vertical and releases her from rest. The potential energy for the child as she is released, compared with the potential energy at the bottom of the swing is given by;`U = mgh``U = 24.0 kg × 9.81 m/s^2 × (1.8 m - 1.8m cos 45°)`On solving this equation, we get `U = 82.1 J`

The potential energy at the bottom of the swing is equal to kinetic energy at the top of the swing since there is no external work done on the system. Therefore, the kinetic energy of the child when she is at the bottom of the swing is equal to the potential energy of the child when she is released.

Kinetic energy at the bottom of the swing is given by;`K = (1/2)mv^2``82.1 J = (1/2) × 24.0 kg × v^2``v = 4.01 m/s`The work done by the tension in the ropes as the child swings from the initial position to the bottom is given by;`W = ∆K = Kf - Ki``W = (1/2)mvf^2 - (1/2)mvi^2``W = (1/2) × 24.0 kg × (4.01 m/s)^2 - (1/2) × 24.0 kg × 0 m/s``W = 193 J`

Therefore, the potential energy for the child as she is released is 82.1 J, she will be moving at a speed of 4.01 m/s at the bottom of the swing, and the work done by the tension in the ropes as the child swings from the initial position to the bottom is 193 J.

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The magnitude of the force that Alice is applying to the box is 110 N.

To calculate the force that Alice is applying, we need to use the equation F = ma. In this equation, F is the force applied, m is the mass of the box, and a is the acceleration of the box.

Since Alice is pushing the box at a constant speed of 2.8 m/s, the acceleration is 0, and the equation simplifies to F = 0 x m. Since the force must equal 0 when the acceleration is 0, the magnitude of the force that Alice is applying to the box is 0.

However, since Bob is pushing an identical box across the floor at a constant speed of 1.4 m/s, the acceleration is 0 and the equation simplifies to F = m x a. In this case, a is the acceleration of the box, which is 1.4 m/s.

Since we know that the magnitude of the force Bob is applying is 55 N, we can use the equation to calculate the force Alice is applying. 55 N = m x 1.4 m/s, which simplifies to m = 39.286.

We then substitute m back into the equation F = ma, so F = 39.286 x 1.4 m/s. This simplifies to F = 55.0 N, so the magnitude of the force Alice is applying is 55.0 N.

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Answer:

Heat is radiated, atmospheric moisture condenses at a rate greater than that at which it can evaporate, resulting in the formation of water droplets.

Explanation:

Dew forms on blades of grass as the temperature of the grass drops below the dew point temperature, causing water vapor in the air to condense into liquid water droplets on the cooler surface of the grass.

Kinetic Energy and Thermal Energy:

Kinetic Energy:

Kinetic energy is the energy possessed by an object due to its motion. It depends on both the mass of the object and its velocity. The formula for kinetic energy is KE = 1/2 * mass * \(velocity^2\). As an object moves faster or its mass increases, its kinetic energy also increases.

Thermal Energy:

Thermal energy, also known as heat energy, is the total energy of the particles (atoms and molecules) in a substance. It includes both the kinetic energy of the particles' random motion and the potential energy of their interactions. The temperature of a substance is a measure of the average kinetic energy of its particles. As the temperature of a substance increases, the average kinetic energy of its particles also increases, leading to higher thermal energy.

Effect of Increasing Temperature on Kinetic Energy and Thermal Energy:

When the temperature of a substance increases:

The average kinetic energy of its particles increases.

The kinetic energy of individual particles increases, resulting in faster molecular motion.

The thermal energy of the substance increases due to the collective increase in kinetic energy of its particles.

Formation of Dew on Blades of Grass:

Dew forms on blades of grass due to a process called condensation. Condensation occurs when water vapor in the air comes into contact with a surface that is at a lower temperature, causing the water vapor to change from its gaseous state to a liquid state.

At night, the Earth's surface loses heat through radiation, and this cooling effect reduces the temperature of the grass blades and other objects on the ground. As the temperature of the grass drops below the dew point temperature, which is the temperature at which the air becomes saturated with water vapor, water vapor in the surrounding air begins to condense into tiny water droplets on the surface of the grass blades.

The formation of dew is more common on clear, calm nights when there is less heat retained by the atmosphere and the ground radiates more heat. Dew can also form when the relative humidity is high, as the air already contains a significant amount of water vapor, making it more likely to reach the dew point temperature.

Hence, dew forms on blades of grass as the temperature of the grass drops below the dew point temperature, causing water vapor in the air to condense into liquid water droplets on the cooler surface of the grass.

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Answer:

34kg

Explanation:

Answer: The Earth moves around the Sun in an extended circular or oval pattern. Or otherwise known as an "elliptical" orbit.

Hope this helps!

Answer:

counter-clockwise

Explanation:

Earth orbits the Sun at an average distance of 149.60 million km (92.96 million mi) in a counterclockwise pattern viewed above the northern hemisphere. One complete orbit takes 365.256 days (1 sidereal year), during which time Earth has traveled 940 million km (584 million mi).

Answer:

Plantae. Also called the Kingdom Metaphyta, the Kingdom Plantae consists of all multicellular, eukaryotic, and photosynthetic organisms on the planet. Being photosynthetic, these organisms are autotrophs and can make their food using the energy from the sun.

On an ECG machine that meets the international standard, the paper moves at 25 mm/second.

Answer: 29.48 s

Explanation:

Given

The initial height of the ball is \(h=2.6\ m\)

The ball leaves with an initial velocity of \(u=-20\ m/s\)

Using the equation of motion

\(h=ut+\dfrac{1}{2}at^2\\\text{Insert the values}\\\\2.6=20\cdot t+\dfrac{1}{2}\times 9.8\times t^2\\\\\Rightarrow 9.8t^2+20t-5.2\\\\\Rightarrow t=\dfrac{-20\pm \sqrt{20^2-4\times 9.8\times (-5.2)}}{2\times 9.8}\\\\\Rightarrow t=\dfrac{-20\pm 603.84}{19.8}\\\\\Rightarrow t=29.48\ s\quad [\text{Neglecting negative t}]\)

Therefore, it take 29.48 s for ball to reach the ground.

The person who first showed that light is an electromagnetic wave was James Clerk Maxwell.

He is a famous physicist from Scotland. In 1865, he proposed his theory of electromagnetic radiation. Maxwell's equations of electromagnetic radiation showed that light is an electromagnetic wave. He based his ideas on the work of other scientists before him, including Michael Faraday. In 1887, Heinrich Hertz performed experiments that confirmed Maxwell's theory of electromagnetic radiation. This helped establish light as an electromagnetic wave and transformed the study of optics. Maxwell’s equations describe how electric and magnetic fields interact with each other. They show that light waves have an oscillating electric field and a magnetic field perpendicular to it. These waves can travel through empty space, which was a major breakthrough. Maxwell's work on electromagnetism was a fundamental step in the development of modern physics.

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Answer:

C.endothermic

Explanation:

chemical reactions

Answer:

C

Explanation:

The term "inflation" refers to a sudden and extremely rapid expansion of the universe that occurred in a tiny fraction of a second during the universe's first second of existence.

This theory was proposed to address certain problems with the Big Bang theory, such as the horizon problem and the flatness problem. Inflation is thought to have caused the universe to expand exponentially, smoothing out irregularities and creating a relatively uniform distribution of matter and energy.

This allowed for the formation of large-scale structures like galaxies and clusters of galaxies. Inflation is supported by a variety of observations, including the cosmic microwave background radiation and the distribution of galaxies in the universe.

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Answer:

Density = Mass / Volume

Mass = Density * volume = 1.6 gm/cm^3 * (7.5 * 12.5 * 2.2) cm^3

Mass = 1.6 gm/cm^3 * (206 cm^3) = 330 gm

Answer:Because if the shape gets changed it will move faster without to much weight

Explanation:

The energy required to raise the temperature of the air in a room by 5.0°C is 336 kJ

U = \(c_{p}\) m ΔT

U = Energy

\(c_{p}\) = Specific heat

m = Mass

ΔT = Change in temperature

ρ = Density

V = Volume

ρ = 1000 g / m³ (Dry air )

= 1 J / g K

ΔT = 5 °C

V = 4 * 4 * 3

V = 48 m³

m = ρ V

m = 1000 * 48

m = 48000 g

U = 1 * 48000 * 7

U = 336000 J

U = 336 kJ

Therefore, the energy required to raise the temperature of the air in a room by 5.0°C is 336 kJ

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