Physical Science Unit 6

The threshold of hearing is a. 0 dB b. 10 dB c. 120 dB d. 60 dB e. 1 dB

a. 0 dB

A sound level of 102 dB is how many times as intense as one of 90 dB a. 16 b. 12 c. 4 d. 24

a. 16

A Doppler red shift indicates a. a shift toward lower frequencies b. a shift toward shorter wavelengths c. that a light source is approaching relative to the observer d. none of these

a. a shift toward lower frequencies

The region of the electromagnetic spectrum with wavelengths just less than those in the x-rays region is the ___________ region a. gamma rays b. microwaves c. infrared d. visible e. radio waves

a. gamma rays

The region of the electromagnetic spectrum with frequencies just greater than those in the microwaves region is the _______ region a. infrared b. ultraviolet c. x-rays d. gamma rays e. visible

a. infrared

Which of the following radiations has the longest wavelength a. infrared b. visible c. ultraviolet d. x-rays

a. infrared

Which of the following radiations has the smallest frequency a. infrared b. visible c. ultraviolet d. x-rays

a. infrared

A sound with a frequency of 15 Hz is in the _______ region of the sound spectrum a. infrasonic b. ultrasonic c. audible d. visible

a. infrasonic

Light can travel to Earth from a distant star, but sound cannot. Why is this a. light is an electromagnetic wave, and sound requires a medium b. the Sun does not make sound c. light is a longitudinal wave, and sound is a transverse wave d. the statement is false; both light and sound can travel in empty space

a. light is an electromagnetic wave, and sound requires a medium

Sound is a(n) a. longitudinal wave b. electromagnetic wave c. transverse wave d. standing wave

a. longitudinal wave

Standing waves can be set up in a string when two waves that are a. of the same frequency and amplitude, but are opposite in direction of travel, meet each other b. of the same frequency, amplitude, and direction of travel are also 180 degrees out of phase c. of the same frequency, amplitude, and direction of travel meet each other d. of the same frequency, amplitude, and velocity meet each other

a. of the same frequency and amplitude, but are opposite in direction of travel, meet each other

For a longitudinal mechanical wave, the particle motion is a. parallel to the direction of the wave velocity b. perpendicular to the direction of the wave velocity c. both parallel and perpendicular to the direction of the wave velocity d. in all directions

a. parallel to the direction of the wave velocity

Wave velocity is inversely proportional to a. period b. wavelength c. amplitude d. all of these

a. period

If a piece of ribbon were tied to a stretched string carrying a transverse wave, how would the ribbon be observed to oscillate a. perpendicular to the wave motion b. parallel to the wave motion c. neither A nor B d. both A and B

a. perpendicular to the wave motion

Which type of electromagnetic energy carries the least energy a. radio b. visible light c. infrared d. ultraviolet

a. radio

The region of the electromagnetic spectrum with wavelengths just greater than those in the microwaves region is the _________ region a. radio waves b. ultraviolet c. x-rays d. gamma rays e. visible

a. radio waves

A disturbance in particle motion perpendicular to the wave velocity is called a a. transverse wave b. acoustic wave c. standing wave d. longitudinal wave

a. transverse wave

Which of the following electromagnetic radiations has the greatest frequency a. ultraviolet b. infrared c. radio d. visible

a. ultraviolet

The region of the electromagnetic spectrum with frequencies just less than those in the gamma rays region is the _________ region a. x-rays b. infrared c. visible d. ultraviolet e. microwaves

a. x-rays

The radiation given off by the nucleus of an atom is called a. a microwave b. a gamma ray c. an x-ray d. any of these

b. a gamma ray

A Doppler red shift indicates a. a shift toward higher frequencies b. a shift toward longer wavelengths c. that a light source is approaching relative to the observer d. none of these

b. a shift toward longer wavelengths

Wave period is the reciprocal of a. amplitude b. frequency c. wave velocity d. all of these

b. frequency

Wave frequency is inversely proportional to a. amplitude b. period c. wave velocity d. all of these

b. period

The Doppler effect is observed only when a. the source of a wave moves toward a stationary observer b. there is relative motion between the source of a wave and an observer c. an observer moves toward the stationary source of a wave d. both the source of a wave and an observer are moving toward each other

b. there is relative motion between the source of a wave and an observer

A sound with a frequency of 30 kHz is in the ________ region of the sound spectrum a. infrasonic b. ultrasonic c. audible d. visible

b. ultrasonic

An increase of 20 dB increases the sound intensity by a factor of a. 10 b. 200 c. 100 d. 20

c. 100

An increase of 50 dB increases the sound intensity by a factor of a. 10,000 b. 500,000 c. 100,000 d. 50,000

c. 100,000

Light waves travel fastest in a. water b. glass c. a vacuum d. air e. none of these; they travel at the same speed in all these media

c. a vacuum

Resonance occurs when a. two different objects vibrate with different frequencies b. two different objects produce beats c. an object having a certain natural frequency is set in vibration by a second object vibrating at that frequency d. an object produces a sound

c. an object having a certain natural frequency is set in vibration by a second object vibrating at that frequency

A sound with a frequency of 3000 Hz is in the _______ region of the sound spectrum a. infrasonic b. ultrasonic c. audible d. visible

c. audible

The major difference between transverse and longitudinal waves is the a. direction of the wave motion b. phase difference c. direction of the particle displacement with respect to the direction of wave motion d. size of the waves

c. direction of the particle displacement with respect to the direction of wave motion

Wave amplitude is related to a. wave velocity b. frequency c. energy d. wavelength

c. energy

A train sounding its horn is moving toward an observer. The pitch of the horn's sound relative to its normal pitch is a. lower b. sometimes higher and sometimes lower c. higher d. the same

c. higher

For a transverse mechanical wave, the particle motion is a. both parallel and perpendicular to the direction of the wave velocity b. parallel to the direction of the wave velocity c. perpendicular to the direction of the wave velocity d. in all directions

c. perpendicular to the direction of the wave velocity

For the Doppler effect to occur, there must be a. a moving source b. a moving observer c. relative motion between a source and an observer d. no motion

c. relative motion between a source and an observer

A Doppler red shift indicates a. a shift toward higher frequencies b. a shift toward shorter wavelengths c. that a light source is receding relative to the observer d. none of these

c. that a light source is receding relative to the observer

How many times greater is the speed of infrared light (800 nm) than the speed of violet light (400 nm) in a vacuum a. 2 b. 1/2 c. 400 d. 1; that is, both have the same speed

d. 1; that is, both have the same speed

Which of the following sound frequencies lie(s) in the audible range a. 25 Hz b. 10 kHz c. 2500 Hz d. All of these

d. All of these

A Doppler red shift indicates a. a shift toward lower frequencies b. a shift toward longer wavelengths c. that a light source is receding relative to the observer d. all of these

d. all of these

Which of the following characterize(s) a wave a. wavelength b. amplitude c. period d. all of these

d. all of these

Wave frequency could be given in a. 1/s b. s^-1 c. Hz d. any of these

d. any of these

A disturbance in particle motion parallel to the wave velocity is called a a. transverse wave b. acoustic wave c. standing wave d. longitudinal wave

d. longitudinal wave

A stretched string can have ________ natural frequency(ies) a. one b. 10 times its length in c. 5 times its length in d. many

d. many

A Doppler red shift indicates a. a shift toward higher frequencies b. a shift toward shorter wavelengths c. that a light source is approaching relative to the observer d. none of these

d. none of these

When an oscillator is driven in resonance, a. there are no standing waves b. any driving frequency may be used c. all natural frequencies are present d. there is maximum energy transfer

d. there is maximum energy transfer

Which type of electromagnetic energy carries the most energy a. radio b. visible light c. infrared d. ultraviolet

d. ultraviolet

Which of the following radiations has the greatest frequency a. infrared b. visible c. ultraviolet d. x-rays

d. x-rays

Which of the following radiations has the smallest wavelength a. infrared b. visible c. ultraviolet d. x-rays

d. x-rays