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Physics: Unit 7 - Light and Optics

Total questions: 47

Worksheet time: 39mins

Name
Class
Date
1.

Unlike mechanical waves, electromagnetic waves can travel through:

a)

a vacuum

b)

water

c)

the ground

d)

air

2.

An object appears red because it:

a)

reflects light waves of all colors

b)

reflects red light waves

c)

absorbs red light waves

d)

transmits light waves of all colors

3.
Which electromagnetic wave carries the most energy?
a)
gamma waves
b)
microwaves
c)
radio waves
d)
light waves
4.

The speed of light in a vacuum is:

a)

represented by the symbol "c"

b)

3.00 × 108 m/s

c)

constant

d)

all answers are correct

5.
Why is light refracted?
a)
Light speeds up
b)
Light slows down
c)
Light speed stays the same
d)
Light can either slow down or speed up
6.

When all three primary light colors are mixed, which color is produced?

a)

black

b)

magenta

c)

white

d)

cyan

7.
Light is considered to be
a)
electromagnetic waves
b)
particles
c)
transverse waves
d)
all of the above
8.

What are the three primary colors of light?

a)

Red, Yellow, Blue

b)

Red, Green, Yellow

c)

Red, Green, Blue

d)

Yellow, Blue, Green

9.

What does it mean to polarize light?

a)

Blocks light

b)

Causes light to travel in only one plane

c)

Reduces the amount of light

d)

Looks cool

10.

Which of the following statements is true about a green grape?

a)

It absorbs green light.

b)

It absorbs white light.

c)

It reflects green light.

d)

It reflects white light.

11.
When red light is compared with violet light,
a)
both have the same frequency.
b)
both have the same wavelength.
c)
both travel at the same speed.
d)
red light travels faster than violet light.
12.

The farther light is from its source,

a)

the more spread out light becomes.

b)

the more condensed light becomes.

c)

the brighter light becomes.

d)

the more light is available per unit area.

13.
A real image...
a)
is produced by virtual rays and can be projected on a screen
b)
is produced by real rays and cannot be projected on a screen
c)
is produced by virtual images and cannot be projected on a screen
d)
is produced by real rays and can be projected on a screen
14.

A converging lens has a focal length of 30 cm. A 5 cm tall candle is placed 10 cm in front of the lens. Determine the image distance.

a)

- 45 cm

b)

-30 cm

c)

-15 cm

d)

6 cm

15.

The number of waves produced in a given period of time.

a)

A. amplitude

b)

B. wave speed

c)

C. frequency

d)

D. wavelength

16.

What is the frequency of red light with a wavelength of 702 nm?

a)

4.27 × 1014 Hz

b)

2.34 × 10-15 Hz

c)

4.27 × 10-4 Hz

17.
Gamma rays have the shortest wavelength, and therefore the ____ frequency.
a)
lowest
b)
highest
18.

What happens when an object absorbs electromagnetic waves?

a)

It bends the object.

b)

It heats the object up.

c)

It causes the object to become transparent.

d)

It stays the same.

19.
What do the most energetic electromagnetic waves possess?
a)
long wavelengths and low frequencies 
b)
short wavelengths and high frequencies 
c)
long wavelengths and high frequencies
d)
short wavelengths and low frequencies 
20.

The law of reflection states that the angle of incidence is always ______ to the angle of reflection.

a)

greater than

b)

less than

c)

equal to

21.

Why is the sky blue?

a)

Because the atmosphere absorbs blue light and reflects the other colors.

b)

Because nitrogen and oxygen molecules scatter blue light more than the other colors.

c)

Because the ocean reflects its blue color to the sky.

d)

Because nitrogen and oxygen molecules scatter red and orange away during sunrise, leaving blue for the daytime.

22.

Which of the following waves has the most energy?

a)

Ultraviolet

b)

Visible light

c)

Infrared

d)

Microwave

23.

Which color bends the most (experiences the greatest refraction) when entering a transparent material?

a)

Red

b)

Yellow

c)

Green

d)

Violet

24.

Which picture shows what happens when light passes through a convex lens?

a)

A - Left picture

b)

B - Right picture

25.

The image is formed when:

a)

all three rays cross

b)

point F is behind the lens

c)

point 2F is behind the lens

26.

Correct order of colors separated by a prism (least bent first):

a)

ROYGBIV

b)

VIBGYOR

c)

YGBIVOR

d)

Cyan, Magenta, Yellow

27.

What is the refractive index of air?

a)

2.42

b)

1.33

c)

1.00

d)

1.5–1.75

28.

According to the law of reflection, a light ray striking a mirror:

a)

continues moving through the mirror in the same direction.

b)

moves into the mirror at a slightly different angle.

c)

bounces off the mirror toward the direction it came from.

d)

bounces off the mirror at the same angle at which it strikes.

29.

The pencil in the glass of water appears to be bent due to...

a)

reflection

b)

refraction

c)

mirrors

d)

focal point

30.

The color of light is determined by the ______ of the light waves.

a)

the medium

b)

the frequency

c)

the amplitude

d)

the speed

31.

Which of the following has the greatest amount of energy?

a)

Red Light

b)

UV

c)

Microwave

d)

X-ray

32.

Which form of light travels the fastest?

a)

Radio

b)

Infrared

c)

Gamma

d)

All travel at the same speed

33.

Magenta light is actually a mixture of 

a)

red and yellow light.

b)

red and cyan light.

c)

yellow and green light.

d)

red and blue light.

34.

Which color, when mixed with red, produces white?

a)

Blue

b)

Green

c)

Yellow

d)

Cyan

35.

For a beam of light, the direction of polarization is defined as:

a)

The direction in which the beam travels.

b)

The direction in which the electric field vibrates.

c)

The direction in which the magnetic field vibrates.

d)

The direction perpendicular to both the electric and magnetic field vectors.

36.

Unpolarized light with an intensity of 42.0 W/m2 enters a polarizer whose transmission axis is at 90.0°. The light then passes through another polarizer whose transmission axis is at 55.0°. What is the intensity of the transmitted light?

a)

6.91 W/m2

b)

21.0 W/m2

c)

14.1 W/m2

d)

0 W/m2

37.

Click on the correct letter for the correct angle of reflection?

A
B
C
D
38.

What type of image does this lens form?

a)

Virtual image

b)

Real image

c)

No image

39.

The image, as seen through this convex lens, will be:

a)

real and larger

b)

real and smaller

c)

virtual and larger

d)

virtual and smaller

40.

Light travels from glass (n = 1.66) to water. What is the critical angle between these two media?

a)

53.2

b)

48.8

c)

37

d)

not possible

41.

What is the speed of light in ice (n = 1.309)?

a)

2.29 × 108 m/s

b)

2.43 × 108 m/s

c)

4.36 × 10-9

d)

4.36 × 108 m/s

42.

What is the index of refraction of a material that allows light to travel at 2.8 × 108 m/s?

a)

1.07

b)

0.67

c)

1.5

d)

Not possible

43.

A person shines a light at a friend who is swimming underwater. If the ray in the water makes an angle of 36.2° with the normal, what is the angle of incidence? (nwater = 1.33)

a)

26.4 degrees

b)

2.25 degrees

c)

51.8 degrees

d)

not possible

44.

As the temperature of a blackbody increases, what happens to the peak wavelength of the light it radiates?

a)

It gets longer

b)

It gets shorter

c)

it is unchanged

45.

In the photoelectric effect, the maximum speed of the electrons emitted by a metal surface when it is illuminated by light depends on which of the following?

I. Intensity of the light

II. Frequency of the light

III. Nature of the photoelectric surface

a)

I only

b)

I and II only

c)

III only

d)

II and III only

e)

All three

46.

In an experiment, light of a particular wavelength is incident on a metal surface, and electrons are emitted from the surface as a result. To produce more electrons per unit time but with less kinetic energy per electron, the experimenter should do which of the following?

a)

Increase the intensity and decrease the wavelength of the light.

b)

Increase the intensity and the wavelength of the light.

c)

Decrease the intensity and the wavelength of the light.

d)

Decrease the intensity and increase the wavelength of the light.

e)

None of the above would produce the desired result.

47.

A photon has a wavelength of 500 nm500 \, \text{nm} . Calculate its frequency. Use c=3×108 m/sc = 3 \times 10^{8} \, \text{m/s} .

a)

6×1014 Hz6 \times 10^{14} \, \text{Hz}

b)

5×1014 Hz5 \times 10^{14} \, \text{Hz}

c)

4×1014 Hz4 \times 10^{14} \, \text{Hz}

d)

3×1014 Hz3 \times 10^{14} \, \text{Hz}

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