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Zach listed the process of how laser beams are produced with crystals.

A flashlamp pumps energy through the crystal.
Atoms in the crystal absorb and then release some of the energy as light.
Light bounces off mirrors and occasionally bounces off crystal atoms, increasing in energy.
Some light escapes the tube through the highly reflective mirror, forming a concentrated beam.

Which best describes Zach’s error?

The crystal pumps energy through the flashlamp; the flashlamp does not pump energy through the crystal.
The atoms in the crystal do not release energy; they only absorb energy.
Light does not bounce off mirrors; it focuses through glass lenses.
Light escapes through the partially reflective mirror, not the highly reflective mirror.

Answer:

C. it’s slowest in a vacuum

Explanation:

When light propagates through a material, it travels slower than the vacuum speed, c.

Answer:

A

Explanation:

I took the test

Answer:

8 N

Explanation:

work=force*distance

force=work/distance

=56/7

=8

Answer:

time graph reveals pertinent information about an object's velocity. For example, a small slope means a small velocity; a negative slope means a negative velocity; a constant slope (straight line) means a constant velocity; a changing slope (curved line) means a changing velocity.

Answer:

the answer is in the pic below :)

Explanation:

Answer:

metric

Explanation:

Answer:

light is an example of a wave that is not mechanical .

it is different as it does not need material medium for its propagation

Answer:

Elevate the wound.

Hope this helped!

Answer:

animals, plants, trees, grass, bacteria, moss, or molds

Explanation:

Anything that is  a living organism is a biotic factor

Knowing the acceleration, distance and initial velocity of a body, its final velocity is 100 m/s.

The final velocity of a body with uniform acceleration can be calculated using the formula:
Vf² = Vi² + 2aΔx

Where Vf is the final velocity, Vi is the initial velocity, a is the acceleration, and Δx is the change in distance.

Plugging in the given values:
Vf² = (60m/s)² + 2(10m/s²)(320m)
Vf² = 3600m²/s² + 6400m²/s²
Vf² = 10000m²/s²
Vf = √(10000m²/s²)
Vf = 100m/s

Therefore, the final velocity of the body is 100m/s.

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Mass, m of the computer is 0.82kg.

Given the following data:

Weight of computer = 8N

Acceleration due to gravity = 9.8m/s

Weight is the product of the mass of an object or body multiplied by gravity.

Mathematically, weight is:

\(\text{W = mg}\)

Where:

W represents the weight of a computer measured in Newton.

m represents the mass of a computer measured in kilograms.

a represents acceleration due to gravity measured in meter per seconds.

\(\text{m}=\frac{\txet{W}}{9}\)

\(\text{m}=\dfrac{8}{9.8}\)

\(\text{m}=0.81632653\thickapprox0.82\)

Mass, m = 0.82kg.

Therefore, the mass of the computer is 0.82kg.

The point of origin is the three dimensional location while the point of convergence is the area containing intersections.

Blood pattern analysis is usually used by the forensic specialists to determine the facts surrounding an investigation using physical nature of blood stains.

There are different types of blood analysis but the one that was displayed in the picture is the impact spatter patterns which contains a point of origin and point of convergence.

The point of origin is the three-dimensional location from which blood spatter originated while the point of convergence is the area containing the intersections generated by lines drawn through the long axes of individual stains that indicates in two dimensions the location of the blood source.

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Answer:

490 J

Explanation:

GPE = mgh = (5.0 kg)(9.8 m/s²)(10 m) = 490 J

A collision that is fully elastic is one where there is no kinetic energy lost during the contact. In an inelastic collision, a proportion of the energy is converted into another kind of energy during the contact.

In elastic collisions, kinetic energy and momentum are both conserved. Consider two similar trolleys that are moving in the same direction at the same pace. With no loss of speed, they collide and bounce off one another. Since no power has been lost, this collision is fully elastic.

photo of A description of completely elastic collision

When a system's maximal quantity of kinetic energy is equal to zero, a relatively inelastic collision takes place.

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A collision that is fully elastic is one where there is no kinetic energy lost during the contact. In an inelastic collision, a proportion of the energy is converted into another kind of energy during the contact.

In elastic collisions, kinetic energy and momentum are both conserved. Consider two similar trolleys that are moving in the same direction at the same pace. With no loss of speed, they collide and bounce off one another. Since no power has been lost, this collision is fully elastic.

photo of A description of completely elastic collision

When a system's maximal quantity of kinetic energy is equal to zero, a relatively inelastic collision takes place.

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Answer:

A proton and an electron have an equal amount but an opposite type of charge. Thus, if an atom contains equal numbers of protons and electrons, the atom is described as being electrically neutral

Answer:

Explanation:

Atoms are electrically neutral because they contain equal quantities of positively charged protons and negatively charged electrons. Electrons and protons have equal but opposite charges, so the result is no net charge. Ions are atoms that have gained or lost electrons. As a result, ions have a net charge.

Answer:

a is the correct choice

Explanation:

The wave has the highest frequency in option A.

The frequency of a wave is the number of cycles completed by the wave in a given period of time. Frequency is measured in Hertz (Hz).

The frequency of a wave is calculated as follows;

\(v = f \lambda\\\\f = \frac{v}{\lambda}\)

where;

From the given chart, in option A the wave completed more cycles in the given period of time.

Thus, the wave has the highest frequency in option A.

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Using Newton's second law

\(\\ \sf\Rrightarrow F=ma\)

\(\\ \sf\Rrightarrow F=142(30)\)

\(\\ \sf\Rrightarrow F=4260N\)

Answer:

30.5 m

Explanation:

(8.7 m/sec)(3.5 sec) = 30.45 m

Answer:

\(0.361\ \text{m}\)

Explanation:

\(f_s\) = Frequency of source = 375 Hz

\(\Delta f\) = Difference between the maximum and minimum sound frequencies = 2.75 Hz

v = Speed of sound in air = 343 m/s

T = Time period = 1.8 s

\(v_m\) = Maximum speed of the microphone

We have the relation

\(\Delta f=2f_s\dfrac{v_m}{v}\\\Rightarrow v_m=\dfrac{\Delta fv}{2f_s}\\\Rightarrow v_m=\dfrac{2.75\times 343}{2\times 375}\\\Rightarrow v_m=1.26\ \text{m/s}\)

Amplitude is given by

\(A=\dfrac{v_mT}{2\pi}\\\Rightarrow A=\dfrac{1.26\times 1.8}{2\pi}\\\Rightarrow A=0.361\ \text{m}\)

The amplitude of the simple harmonic motion is \(0.361\ \text{m}\).

Alyssa mixed 12 mL of a salt solution with 9mL of a 39% salt solution, to make a 56% salt solution. The percent salt concentration of the first solution will be 78.08 %.

An algebraic expression in mathematics is an expression which is made up of variables and constants, along with algebraic operations (addition, subtraction, etc.)

let x = percentage of 12ml of solution

12x + 0.39 (9) = 0.56 (12 + 11)

12x + 3.51 = 12.88

x = 0.7808

The percent salt concentration of the first solution will be 78.08 %

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Answer:

true

Explanation:

you don't need an explanation

We can see here that after turning on the light switch the level that you set the rheostat is to the lowest level.

A rheostat is a variable resistor that is used to control the amount of current flowing through a circuit. In a lighting circuit, the rheostat is used to control the brightness of the light.

When the rheostat is set to the lowest level, the most resistance is present in the circuit, which reduces the amount of current flowing through the light bulb. This results in a dimmer light.

As the rheostat is turned up, the resistance in the circuit decreases, which allows more current to flow through the light bulb. This results in a brighter light.

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Answer:

the time taken for the box to stop is 3.6 s.

Explanation:

Given;

initial speed with which the box was pushed, u = 5 m/s

time taken for the box to stop, t = 1.5 s

Assuming the box is moving at constant acceleration, a;

\(a = \frac{u}{t} \\\\a = \frac{5}{1.5} \\\\a = 3.33 \ m/s\)

When the box is pushed a speed of 12 m/s, the time taken for the box to stop is calculated as;

\(t = \frac{v}{a} \\\\t = \frac{12}{3.33} \\\\t = 3.6 \ s\)

Therefore, the time taken for the box to stop is 3.6 s.

Explanation:

for v vs t graph for t=9 to 11,v=15kmph

similarly v2=0,v3=60kmph&v4= -40kmph

The length of the minute hand of a wall clock is not relevant to finding the distance traveled by the end of the pointer in a given amount of time. The only important factors are the length of the hour hand and the amount of time that has passed.

If the length of the hour hand is X cm, then the distance traveled by the end of the pointer in 2 hours can be calculated as follows:

Distance traveled = (X * π * 2) cm

Here, π is the mathematical constant approximately equal to 3.14. The factor of 2 in the formula represents the number of hours that have passed. Therefore, to find the distance traveled in 2 hours, you would need to know the length of the hour hand and substitute it for X in the formula above.

Lets do

We know

The rate of change of velocity is acceleration .

\(\\ \sf\longmapsto a=\dfrac{dv}{dt}\)

\(\\ \sf\longmapsto dv=adt\)

Integrate both sides

\(\\ \sf\longmapsto \int dv=a\int dt\)

As acceleration is constant .Take it outside of integral .On velocity we can take limit u to v and time from 0 to t

\(\\ \sf\longmapsto {\displaystyle{\int}}^v_u dv=a{\displaystyle{\int}}^t_0 dt\)

Hence

\(\\ \sf\longmapsto v{\huge{|}}^v_u=at\)

\(\\ \sf\longmapsto v-u=at\)

\(\\ \sf\longmapsto v=u+at\)

Answer:

2.8

Explanation:

power=work done/time

so, to calculate time

we know,

time(s)=work done(j)/power(w)

=350/125

=2.8

Answer:

yes it is

Explanation:

Answer:

Answer is D

Explanation:

By changing the direction of the current moving through the wire will change polarity of the magnet but it will not affect the strength of the magnet.

I can help you with that. To find the dimensions of volume, we need to express the answer in terms of length (l), mass (m), and time (t). The dimensions of volume can be expressed as [l^3], where the exponent 3 represents the power of length.

Volume is a measure of the amount of space occupied by an object. It is derived from multiplying three lengths together. Since each length has dimensions [l], when we multiply them, we get [l^3]. This means that volume is measured in cubic units, such as cubic meters (m^3) or cubic centimeters (cm^3).

To summarize, the dimensions of volume are expressed as [l^3], where the exponent 3 represents the power of length. Volume is a measure of the amount of space occupied by an object. It is derived from multiplying three lengths together. Since each length has dimensions [l], when we multiply them, we get [l^3]. This means that volume is measured in cubic units, such as cubic meters (m^3) or cubic centimeters (cm^3).

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