Deck 7: Light

Question 1

If angle A is 60º, what does angle C measure?

A)60º
B)90º
C)30º
D)roughly 25º

Answer 1

C

Question 2

What is the refracted ray indicated by?

A)1
B)2
C)3
D)4

Answer 2

B

Question 3

Glare is light that tends to be polarized predominantly in the horizontal plane.

Answer 3

True

Question 4

The change in the direction of light as it passes through the boundary between two media is called refraction.

Question 5

The frequency of radiation is

A)directly proportional to its wavelength.
B)inversely proportional to the velocity.
C)independent of the temperature of the source.
D)None of the above.

Question 6

Longer wavelengths are affected more by a prism or water droplets than are the shorter wavelengths.

Question 7

You are able to see non-luminous objects because light has undergone

A)diffuse reflection.
B)refraction.
C)constructive interference.
D)a change in speed.

Question 8

Interference is a property of light most easily explained by the particle model.

Question 9

Phenomena such as diffraction and interference can be most easily explained in terms of the

A)ray model of light.
B)particle model of light.
C)wave model of light.
D)photoelectric effect.

Question 10

Which of the following object does not emit light?

A)a candle flame
B)the Sun
C)the Moon
D)a burning coal

Question 11

The colors of the visible spectrum can be measured in units of

A)wavelength.
B)frequency.
C)energy.
D)All of the above.

Question 12

When an electric stove element is hot enough, it gives off a dull red glow.When it cools to the point that it no longer glows, it will

A)emit shorter wavelength radiation.
B)emit the same wavelength as before, but with less energy.
C)emit longer wavelength radiation.
D)stop emitting radiation altogether.

Question 13

The angle of incidence is equal to the angle of refraction.

Question 14

If 1 is the incident ray, what is the angle of reflection?

A)A
B)B
C)C
D)D

Question 15

A fluorescent light source emits light as a result of high temperature.

Question 16

The radiation from the Sun is most intense near the yellow-green wavelength.

Question 17

Ultraviolet light carries more energy than infrared radiation.

Question 18

The slower light travels in a given media, the greater the index of refraction.

Question 19

The sky appears blue due to the light reflected from the oceans.

Question 20

What are the units of h in the equation E = hf?

A)
B)
C)J.s
D)W.m

Question 21

Max Planck discovered that the blackbody radiation emitted by vibrating molecules

A)was continuous, like a train of waves.
B)was constant for all objects.
C)varied greatly from one experiment to the next.
D)appeared to come in multiples of certain fixed amounts.

Question 22

A prism separates the colors of sunlight into a spectrum because

A)red light is refracted the most, while violet light is refracted the least.
B)longer wavelengths are bent more than shorter wavelengths.
C)each wavelength of light has its own index of refraction.
D)it polarizes the different wavelengths of light.

Question 23

When monochromatic light from two slits arrive at a point on a screen out of phase,

A)a dark region is produced.
B)a bright region is produced.
C)two different colors of light are observed.
D)a region of polarized light is produced.

Question 24

Total internal reflection

A)occurs when light strikes an interface at greater than the critical angle.
B)accounts for the brilliance of cut diamonds.
C)allows light to travel in a curved path inside an optic fiber.
D)All of these are true.

Question 25

Nearsightedness, or myopia, can be corrected with what type lens?

A)convex
B)concave
C)reflecting
D)None of the above.

Question 26

The index of refraction for flint glass is 1.5.This means that

A)light travels faster in this medium than it does in vacuum.
B)the wavelength of light passing through glass is 1.5* as long as it is in vacuum.
C)the speed of light is slower in this medium than it is in vacuum.
D)a ray of light is refracted away from the normal as it passes from air into glass.

Question 27

Polarized light vibrates

A)only in one plane.
B)in two planes at right angles to one another.
C)in all planes.
D)not at all.

Question 28

The photoelectric effect could not be adequately explained with a wave model of light because

A)the energy of the electrons ejected from a metal varied directly with the intensity.
B)the number of electrons ejected from a metal depended upon the intensity.
C)the number of electrons ejected from a metal depended upon the wavelength.
D)the energy of the ejected electrons did not depend upon the intensity.

Question 29

A mirage is caused by hot air near the ground

A)refracting light rays upward.
B)reflecting light rays upward.
C)refracting light rays downward.
D)reflecting light rays downward.

Question 30

A rainbow always appears

A)in the part of the sky in the same direction as the Sun.
B)in the part of the sky opposite from the Sun.
C)at an angle of 50 to 54 degrees from the Sun.
D)only at sunset.

Question 31

The Sun appears reddish as it sets because

A)the Sun emits more radiation at longer wavelengths at sunset.
B)more of the shorter, bluer wavelengths are scattered by the dust and haze.
C)the Doppler shift lowers the frequency as a given spot on Earth rotates away from
D)the Sun.
E)more of the longer, redder wavelengths are scattered by the atmosphere.

Question 32

Farsightedness, or hyperopia, can be corrected with what type lens?

A)convex
B)concave
C)reflecting
D)None of the above.

Question 33

Polarizing sunglasses are useful because they are able to

A)use the critical angle to block light.
B)reflect glare.
C)absorb reflected light, which is polarized.
D)refract reflected light, which causes glare.

Question 34

The image formed by a plane mirror is

A)virtual.
B)real.
C)a result of diffuse reflection.
D)smaller than the object.

Question 35

We explain light today

A)mostly with particle models.
B)mostly as a wave phenomenon.
C)as having both wave and particle behavior.
D)as something completely unknown.