Module 15

Question 1

Electromagnetic Wave:

Answer 1

A transverse wave composed of an oscillating electric field and a magnetic field that oscillates perpendicular to the electric field.

Question 2

The law of reflection

Answer 2

the angle of reflection equals the angle of incidence.

Question 3

Explain the wave theory of light, the particle theory of light, and the quantum-mechanical theory of light.

Answer 3

1. it views light as two transvers waves, one made of an oscillating magnetic field and the other and oscillating electric field. 2 it views a ray of light as a beam of individual particles called photons. 3. it says that light is both a particle and a wave. It is made up of individual packets that behave like particles, but the packets is actually made up of a wave which has an oscillating electric field and a magnetic field that oscillates perpendicular to the electric field.

Question 4

Sound waves cause air to oscillate. What do light waves oscillate?

Answer 4

electric and magnetic fields.

Question 5

What does Einstein’s special theory of relativity say about the speed of light?

Answer 5

nothing with mass can travel faster than the speed of light.

Question 6

Light is traveling through water and suddenly breaks the surface and travels through air. Did light’s speed increase, decrease, or stay the same once it left the water?

Answer 6

Increase

Question 7

Order the following colors in terms of increasing wavelength: orange, violet, yellow, green. In other words, list the color corresponding to the smallest wavelength first, and end with the color that corresponds to the longest wavelength.

Answer 7

Violet, green, yellow, orange

Question 8

Order the colors orange, violet, yellow, green in terms of increasing frequency. Once again, start with the lowest frequency and end with the frequency.

Answer 8

Orange, Yellow, Green, Violet.

Question 9

Do radio waves have higher or lower frequencies then visible light? What about X-rays?

Answer 9

1 lower 2 higher

Question 10

Infrared light is given off by any object that is losing heat. The human body is almost always losing heat to the environment. Why, then, don’t human bodies glow at night, since they are emitting light?

Answer 10

Infrared light is not visible

Question 11

Light his a mirror, making an angle of 15 degrees relative to a line drawn perpendicular to the mirror’s surface. What angle does the reflected light make with the same line? When light travels from one substance to another, what 2 things can happen to the direction of the light ray’s travel?

Answer 11

15 degrees

Question 12

In the diagram, will the man see his foot, despite the fact that the mirror does not reach the ground? Why?

Answer 12

Yes because of the law of reflection which states “the angle of reflection equals the angle of incidence.”

Question 13

When light travels from one substance to another, what two things can happen to the direction of the light ray’s travel?

Answer 13

Reflected, refracted

Question 14

In a physics experiment, a light ray is examined as it travels from air into glass. If the angle that the light ray makes with a line perpendicular to the glass surface is measured, will the refracted ray bend toward or away from that line?

Answer 14

Since light moves faster in are than in glass the light will bent towards the line.

Question 15

In order for you to see a rainbow, what 3 conditions must be met?

Answer 15

1 water droplets suspended in air 2 the sun must be shining on them from behind you 3 and the sun must be at a certain angle.

Question 16

What is the difference between a converging lens and a diverging lens

Answer 16

C Lens: causes light rays to bend so that they converge to a single point. D Lens: causes light rays to bend away from each other.

Question 17

When you look at objects underwater from above the water, they appear to be at a different position that their actual position. Why?

Answer 17

When light travels from water to air it bends. This causes your mind to form a false image of the object in a slightly different location.

Question 18

What is special about the way the eye focuses light as compared to the way a camera focuses light?

Answer 18

The eye focuses light by changing the shape of its lens. A camera focuses light by moving the position of the lens.

Question 19

Suppose the cone cells on your retina that sense res light no longer work. If you look at a white piece of paper, what color would it appear to be/ If you look at a red piece of paper, what color would it appear to be?

Answer 19

appear blue- green (cyan)

appear black

Question 20

A shirt is dyed so that it looks violet. What colors of light does the dye absorb?

Answer 20

red, yellow, orange, green blue, and indigo light

Question 21

A cyan dye is made of a mixture of substances that absorb all light colors except blue and green. If you took a piece of paper and placed it in a dark room and shined red light on it, what would you see? What would you see if you shined green light on it?

Answer 21

1 black 2 green?

Question 22

Which has a higher frequency: green or yellow light?

Answer 22

Green (it has a smaller wave length)

Question 23

Draw what happens to the light ray when it hits the right side of the aquarium

Answer 23

when the light enters the glass it reflects out and refracts in travels threw and then reflects in and refracts out.

Question 24

If cyan and magenta ink is mixed, what color ink will you get?

Answer 24

Blue.

Question 25

If you shine red light on a yellow shirt, what color will the shirt appear? Assume the shirt color is done with dyes that use subtractive primary colors.

Answer 25

red.

Question 26

Additive primary colors:

Subtractive Primary Colors:

Answer 26

RED I YELLOW
yellow magenta I red green
White I Black
GREEN Cyan BLUE I MAGENTA blue CYAN