Question 1

Which part of the electromagnetic spectrum can we see with our eyes?

Accepted Answer

Visible light

Answer

Ultraviolet waves

Answer

Radio waves

Answer

Infrared waves

Question 2

Which part of the electromagnetic spectrum has the lowest frequency?

Accepted Answer

Radio waves

Answer

Gamma rays

Answer

Infrared waves

Answer

X-rays

Question 3

An experiment compares the emission of infrared waves from different color surfaces by filling the cans with hot water and measuring the drop in temperature over a certain time. Which variable should be different for each test?

Accepted Answer

Start temperature of the water in the cans.

Answer

Type of metal the can is made from.

Answer

Final temperature of the water in the cans.

Answer

Volume of hot water in the cans.

Question 4

Which of these experiments could show that infrared waves transfer thermal energy?

Accepted Answer

Melting chocolate under a grill.

Answer

Melting chocolate in your mouth

Answer

Melting chocolate in a microwave oven.

Answer

Melting chocolate by sitting it on a radiator.

Question 5

How are radio waves produced?

Accepted Answer

By oscillations in electrical circuits

Answer

Moving electrons heat up a wire

Answer

If an electron in an atom drops from one energy level to a lower level

Answer

Changes of the energy state of a nucleus

Question 6

Why do ultraviolet waves have more energy than microwaves?

Accepted Answer

The energy depends on the frequency, and ultraviolet is higher frequency than microwaves.

Answer

The energy depends on the speed, and ultraviolet travels at lower speed than microwaves.

Answer

The energy depends on the speed, and ultraviolet travels at higher speed than microwaves.

Answer

The energy depends on the frequency, and ultraviolet is lower frequency than microwaves.

Question 7

Why would spying organizations prefer people to use the radio signals of their mobile phones, rather than sending computer messages via optical fibers?

Accepted Answer

Optical fibers are more secure because the signals stay in the fiber.

Answer

The light waves in optical fibers have a shorter wavelength than radio waves.

Answer

Optical fibers are more expensive than radio equipment.

Answer

Radio equipment is more expensive than optical fibers.

Question 8

Why are gamma rays useful for sterilizing surgical instruments?

Accepted Answer

Gamma rays are ionizing radiation which can kill bacteria.

Answer

Gamma rays are often used to make food last longer by killing disease-carrying organisms.

Answer

Hospitals already have gamma sources as part of the cancer treatments so it saves money.

Answer

Gamma rays are very high frequency and this resonates the bacteria off the instruments.

Question 9

Which type of electromagnetic waves cause sunburns?

Accepted Answer

Ultraviolet ray

Answer

Gamma rays

Answer

Infrared wave

Answer

Microwave

Question 10

What type of electromagnetic waves are used to cook food, predict the weather, and for communications?

Accepted Answer

Microwaves

Answer

Infrared wave

Answer

Gamma rays

Answer

Ultraviolet ray

Question 11

Which type of waves is used on a TV remote control?

Accepted Answer

Infrared wave

Answer

Ultraviolet ray

Answer

Radio wave

Answer

Gamma rays

Question 12

Which is NOT a negative effect of low-frequency ultraviolet radiation?

Accepted Answer

Destroys vitamin A

Answer

Damages DNA

Answer

Damages collagen

Answer

Ionizes atoms in the body

Question 13

What type of electromagnetic radiation is used in mobile phones?

Accepted Answer

Microwaves

Answer

Ultraviolet ray

Answer

Infrared wave

Answer

X-rays

Question 14

Which material can stop gamma rays?

Accepted Answer

A thick slab of concrete with a few inches of lead

Answer

A thick bronze

Answer

A thick paper

Answer

A thick silver

Question 15

What type of electromagnetic waves are used to take pictures of bones in medicine?

Accepted Answer

X-rays

Answer

Ultraviolet ray

Answer

Infrared wave

Answer

Microwaves

Question 16

Which would be the best physical demonstration of a transverse wave?

Accepted Answer

Oscillating a chain side to side

Answer

A clock chiming the hour

Answer

Bumper to bumper traffic

Answer

Back and forth oscillation in a Slinky

Question 17

Which type of waves have both longitudinal and transverse motion?

Accepted Answer

Water waves

Answer

Electromagnetic waves

Answer

Light waves

Answer

X-ray waves

Question 18

Which type of wave has longitudinal (compressional) motion?

Accepted Answer

Sound waves

Answer

Light waves

Answer

X-ray waves

Answer

EM waves

Question 19

We identify different types of waves in the EM spectrum based on their…

Accepted Answer

Frequency

Answer

Amplitude

Answer

Wave speed

Answer

Phase

Question 20

A class of students on a field trip to the space museum came across the image on the right. Their teacher asked four of the students to present one fact about the electromagnetic spectrum as it would relate to outer space. Which student(s) presented correct information?

Accepted Answer

Student B, C, D

Answer

Student A and C

Answer

None

Answer

Student C and D

Question 21

The amplitude of two light waves (Light Wave A and Light Wave B) as a function of time are shown on the right. Refer to the information and graphs shown. Compare the period of time for Light Wave A to that of Light Wave B. Light Wave A has a period of time that is...

Accepted Answer

Half of B

Answer

One-fourth of B

Answer

Twice B

Answer

Same as B

Question 22

Refer to the above information and graphs. Compare the frequency of Light Wave A to that of Light Wave B. Light Wave A has a frequency that is...

Accepted Answer

Twice B

Answer

One-fourth of B

Answer

Same as B

Answer

Half of B

Question 23

As amplitude of a mechanical wave increases, what increases?

Accepted Answer

Energy

Answer

Speed

Answer

Frequency

Answer

Wavelength

Question 24

A student examined the motion of waves on a Slinky® by oscillating a spring along the floor. The student took a snapshot of the motion as shown on the right. What is the wavelength of the wave according to the Displacement v. Length graph above?

Accepted Answer

1.0 m

Answer

0.5 m

Answer

0.25 m

Answer

2.0 m

Question 25

A student examined the motion of waves on a Slinky® by oscillating a spring along the floor. The student took a snapshot of the motion as shown below&#58; Refer to the graph shown above. The student oscillates the spring 4 times per second. What is the velocity of the wave? (V=fλ) Hint&#58; Solve for wavelength from the graph.

Accepted Answer

2.0 m/s

Answer

0.5 m/s

Answer

4.0 m/s

Answer

1.0 m/s

Question 26

Which wave property cannot be changed by reducing velocity?

Accepted Answer

Frequency

Answer

Wavelength

Answer

Amplitude

Answer

Period

Question 27

A student used a rope tied to a wall and formed a standing wave, as shown in Figure 1. The student then produced the second standing wave, as shown in Figure 2. According to the information and diagram shown above, which of the following wave properties increased?

Accepted Answer

Frequency

Answer

Period

Answer

Wavelength

Answer

Amplitude

Question 28

A student creates a graph of position v. time for the height of a floating buoy as ocean waves go by. What is the amplitude of the buoy based on the graph on the graph?

Accepted Answer

2.5 m

Answer

Varies

Answer

2.0 m

Answer

5.0 m

Question 29

A student creates a graph of position v. time for the height of a floating buoy as ocean waves go by. Refer to the graph above. At what time will the buoy be at a crest?

Accepted Answer

1.5 s

Answer

0 s

Answer

1.0 s

Answer

0.5 s

Question 30

What EM wave travels the fastest?

Accepted Answer

All travel at c

Answer

Microwave

Answer

X-ray

Answer

Ultraviolet

Question 31

An astronomer is star gazing on the night when there is no Moon. He sees two blue stars in the sky, and one star is much brighter than the other. Which property of electromagnetic waves allows the astronomer to determine the brightness of a star?

Accepted Answer

Amplitude

Answer

Wavelength

Answer

Frequency

Answer

Velocity

Question 32

How many waves are visible?

Accepted Answer

5

Answer

3

Answer

4

Answer

1

Question 33

How long did it take all waves to travel?

Accepted Answer

5 sec

Answer

4 sec

Answer

1 sec

Answer

3 sec

Question 34

Which wave has highest frequency?

Accepted Answer

3

Answer

2

Answer

—

Answer

1

Question 35

These waves differ in their ___?

Accepted Answer

Frequency

Answer

Wavelength

Answer

Amplitude

Answer

Period

Question 36

The time it takes for one wave is called the…

Accepted Answer

Period

Answer

Hz

Answer

—

Answer

Frequency

Question 37

What is the name of item 1?

Accepted Answer

Amplitude

Answer

Wavelength

Answer

Period

Answer

Frequency

Question 38

What is the name of item 2?

Accepted Answer

Wavelength

Answer

Frequency

Answer

Amplitude

Answer

Period

Question 39

What is the name of item 3?

Accepted Answer

Period

Answer

Frequency

Answer

Amplitude

Answer

Wavelength

Question 40

What is the frequency of this wave system? ("how many waves occurred within the one second?")

Accepted Answer

2.5 Hz

Answer

1 Hz

Answer

2 Hz

Answer

1.5 Hz

Question 41

A boy stands in front of a plane mirror. How can he see his shoes?

Accepted Answer

Place mirror lower

Answer

Place mirror higher

Answer

Move closer

Answer

Move farther

Question 42

What is a plane mirror?

Accepted Answer

Flat reflective surface

Answer

Flat non-reflective surface

Answer

Concave reflective surface

Answer

Convex reflective surface

Question 43

Size of image formed by a plane mirror?

Accepted Answer

Same size

Answer

Random size

Answer

Half object

Answer

Twice object

Question 44

What image do you see in a plane mirror?

Accepted Answer

Virtual image

Answer

Real image

Answer

No image

Answer

Distorted image

Question 45

Which describes the Doppler effect?

Accepted Answer

Change in frequency/wavelength

Answer

Change in direction

Answer

Change in speed

Answer

Change in amplitude

Question 46

What affects Doppler shift?

Accepted Answer

Relative velocity

Answer

Distance between source and observer

Answer

Amplitude of wave

Answer

Wavelength of wave

Question 47

Example of Doppler effect?

Accepted Answer

Change in pitch of a car horn passing by

Answer

Change in volume of car engine

Answer

Change in color of moving object

Answer

Change in temperature of liquid

Question 48

The color black is seen when all light is…

Accepted Answer

Absorbed

Answer

Reflected

Answer

—

Answer

Refracted

Question 49

The color white is seen when all light is…

Accepted Answer

Reflected

Answer

Refracted

Answer

—

Answer

Absorbed

Question 50

What causes a prism to bend different colors of light?

Accepted Answer

Differences in wavelengths

Answer

Differences in brightness

Answer

Prism parts made of different materials

Answer

Differences in position

Question 51

Calculate the speed of a periodic wave that has a wavelength of 2.0 m and a frequency of 3.0 Hz.

Accepted Answer

6 m/s

Question 52

A particular light source gives off light waves with a measured wavelength of 2.0 X 10^-7 m. What is the frequency of the light source? (3E8 m/s = V) Where V=fλ

Accepted Answer

$1.5x10^{15\ }Hz$

Question 53

(At a temperature of 27.0°C, what is the speed of longitudinal waves in (a) hydrogen (molar mass 2.02 g>mol)

Accepted Answer

1310 m/s

Question 54

(At a temperature of 27.0°C, what is the speed of longitudinal waves in (b) helium (molar mass 4.00 g>mol);

Accepted Answer

1021 m/s

Question 55

(At a temperature of 27.0°C, what is the speed of longitudinal waves in (c) argon (molar mass 39.9 g>mol)?

Accepted Answer

323 m/s

Question 56

On the planet Arrakis a male ornithoid is flying toward his mate at 25.0 m>s while singing at a frequency of 1200 Hz. If the stationary female hears a tone of 1240 Hz, what is the speed of sound in the atmosphere of Arrakis?

Accepted Answer

774 m/s

Question 57

Two train whistles, A and B, each have a frequency of 392 Hz. A is stationary and B is moving toward the right (away from A) at a speed of 35.0 m>s. A listener is between the two whistles and is moving toward the right with a speed of 15.0 m>s (Fig. E16.45). No wind is blowing. (a) What is the frequency from A as heard by the listener?

Accepted Answer

374.9 Hz

Question 58

Two train whistles, A and B, each have a frequency of 392 Hz. A is stationary and B is moving toward the right (away from A) at a speed of 35.0 m>s. A listener is between the two whistles and is moving toward the right with a speed of 15.0 m>s (Fig. E16.45). No wind is blowing. (b) What is the frequency from B as heard by the listener?

Accepted Answer

371.3 Hz

Question 59

Two train whistles, A and B, each have a frequency of 392 Hz. A is stationary and B is moving toward the right (away from A) at a speed of 35.0 m>s. A listener is between the two whistles and is moving toward the right with a speed of 15.0 m>s (Fig. E16.45). No wind is blowing. (c) What is the beat frequency detected by the listener?

Accepted Answer

3.59 Hz

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