Question 1

If the Sun were to disappear at this moment, we wouldn't know about it for

Accepted Answer

A) 7 seconds, reflex time. 
B) 8 seconds. 
C) 8 minutes. 
D) 8 hours. 
A) 7 seconds, reflex time. 
B) 8 seconds. 
C) 8 minutes. 
D) 8 hours.

Question 2

Which of the following is fundamentally different from the others?

Accepted Answer

A) sound waves 
B) X-rays 
C) gamma rays 
D) light waves 
E) radio waves 
A) sound waves 
B) X-rays 
C) gamma rays 
D) light waves 
E) radio waves

Question 3

Radio waves travel

Accepted Answer

A) always much faster than sound waves. 
B) in common cases at the same speed as sound waves. 
C) slower, on average, than sound waves. 
D) at a speed that depends on frequency. 
A) always much faster than sound waves. 
B) in common cases at the same speed as sound waves. 
C) slower, on average, than sound waves. 
D) at a speed that depends on frequency.

Question 4

Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency of the re-emitted light is

Accepted Answer

A) considerably less. 
B) slightly less. 
C) the same. 
D) slightly more. 
E) considerably more. 
A) considerably less. 
B) slightly less. 
C) the same. 
D) slightly more. 
E) considerably more.

Question 5

Which of these electromagnetic waves have the longest wavelength?

Accepted Answer

A) radio waves 
B) infrared waves 
C) X-rays 
D) ultraviolet waves 
E) light waves 
A) radio waves 
B) infrared waves 
C) X-rays 
D) ultraviolet waves 
E) light waves

Question 6

Glass is transparent to wave frequencies that

Accepted Answer

A) match its natural frequencies. 
B) are below its natural frequencies. 
C) both of these 
D) neither of these 
A) match its natural frequencies. 
B) are below its natural frequencies. 
C) both of these 
D) neither of these

Question 7

Compared to its average speed in air, the average speed of a beam of light in glass is

Accepted Answer

A) more. 
B) less. 
C) the same. 
A) more. 
B) less. 
C) the same.

Question 8

In free space, electromagnetic waves travel at a

Accepted Answer

A) variety of speeds. 
B) single speed. 
C) speed depending on frequency. 
A) variety of speeds. 
B) single speed. 
C) speed depending on frequency.

Question 9

Most of the waves in the electromagnetic spectrum are

Accepted Answer

A) red light. 
B) blue light. 
C) green light. 
D) invisible. 
A) red light. 
B) blue light. 
C) green light. 
D) invisible.

Question 10

Your friend says that any radio wave travels appreciably faster than any sound wave.

Accepted Answer

A) agree with your friend unconditionally 
B) agree with your friend for most common cases 
C) disagree with your friend 
D) find a new friend 
A) agree with your friend unconditionally 
B) agree with your friend for most common cases 
C) disagree with your friend 
D) find a new friend

Question 11

A new Moon appears in the sky just before the time of a

Accepted Answer

A) solar eclipse. 
B) lunar eclipse. 
C) both of these 
D) neither of these 
A) solar eclipse. 
B) lunar eclipse. 
C) both of these 
D) neither of these

Question 12

The main difference between the retina of a human eye and that of a dog's eye is the

Accepted Answer

A) predominance of cones in a dog's retina. 
B) absence of cones in a dog's retina. 
C) more intricate optic nerve in a human's eye. 
D) small number of cones in a human's eye. 
E) none of the above 
A) predominance of cones in a dog's retina. 
B) absence of cones in a dog's retina. 
C) more intricate optic nerve in a human's eye. 
D) small number of cones in a human's eye. 
E) none of the above

Question 13

The speed of light in the void between molecules in glass is

Accepted Answer

A) more than its speed in a vacuum. 
B) the same as its speed in a vacuum. 
C) less than its speed in a vacuum. 
A) more than its speed in a vacuum. 
B) the same as its speed in a vacuum. 
C) less than its speed in a vacuum.

Question 14

A solar eclipse occurs when the

Accepted Answer

A) Sun passes into Earth's shadow. 
B) Moon passes into Earth's shadow. 
C) the Moon's shadow is cast on Earth. 
D) none of the above 
A) Sun passes into Earth's shadow. 
B) Moon passes into Earth's shadow. 
C) the Moon's shadow is cast on Earth. 
D) none of the above

Question 15

When an astronaut on the Moon experiences a solar eclipse, observers on Earth see

Accepted Answer

A) a lunar eclipse. 
B) a solar eclipse. 
C) no eclipse at all. 
A) a lunar eclipse. 
B) a solar eclipse. 
C) no eclipse at all.

Question 16

What is the wavelength of an electromagnetic wave that has a frequency of 3 kilohertz?

Accepted Answer

A) less than 1 km 
B) 1 km 
C) more than 1 km 
A) less than 1 km 
B) 1 km 
C) more than 1 km

Question 17

When visible light is incident upon clear glass, atoms in the glass

Accepted Answer

A) are forced into vibration. 
B) resonate. 
C) convert the light energy into internal energy. 
A) are forced into vibration. 
B) resonate. 
C) convert the light energy into internal energy.

Question 18

Our eyes are not very good at seeing

Accepted Answer

A) motion at our peripheries. 
B) differences in brightness. 
C) color in dim light. 
D) all of the above 
E) none of the above 
A) motion at our peripheries. 
B) differences in brightness. 
C) color in dim light. 
D) all of the above 
E) none of the above

Question 19

The sensation of color is seen when light falls on the eye's

Accepted Answer

A) rods. 
B) cones. 
C) both of these 
D) neither of these 
A) rods. 
B) cones. 
C) both of these 
D) neither of these

Question 20

If the color spectrum ranges from red to violet, then it ranges from

Accepted Answer

A) low frequencies to high frequencies. 
B) long wavelengths to short wavelengths. 
C) both of these 
D) neither of these 
A) low frequencies to high frequencies. 
B) long wavelengths to short wavelengths. 
C) both of these 
D) neither of these

Exam 26: Properties of Light

If the Sun were to disappear at this moment, we wouldn't know about it for

Which of the following is fundamentally different from the others?

Radio waves travel

Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency of the re-emitted light is

Which of these electromagnetic waves have the longest wavelength?

Glass is transparent to wave frequencies that

Compared to its average speed in air, the average speed of a beam of light in glass is

In free space, electromagnetic waves travel at a

Most of the waves in the electromagnetic spectrum are

Your friend says that any radio wave travels appreciably faster than any sound wave.

A new Moon appears in the sky just before the time of a

The main difference between the retina of a human eye and that of a dog's eye is the

The speed of light in the void between molecules in glass is

A solar eclipse occurs when the

When an astronaut on the Moon experiences a solar eclipse, observers on Earth see

What is the wavelength of an electromagnetic wave that has a frequency of 3 kilohertz?

When visible light is incident upon clear glass, atoms in the glass

Our eyes are not very good at seeing

The sensation of color is seen when light falls on the eye's

If the color spectrum ranges from red to violet, then it ranges from

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