Practice test chap 5 physic

The restoring force of a spring is proportional to the displacement of the object at the end (T/F)

True

The frequency is the time required for one complete cycle (T/F)

False. Correct answer -Period

Waves that move through air are transverse (T/F)

False. Correct answer- Longitudinal

The amplitude of a wave is the distance from the crest to the equilibrium position (T/F)

True

Sound travels faster through cold, denser air than through warm, less dense air (T/F)

False. Correct answer- travel faster through warmer air

Piano tuners listen to the beat frequency between their tuning fork and the wire they are tuning (T/F)

True

A sound of 20 dB intensity is twice as loud as one of 10 dB (T/F)

False. 10dB = 1 x 10^-11 20dB = 1 x 10^-10

In resonance the amplitude of a vibrating source becomes larger (T/F)

False

The fundamental frequency of a vibrating string has a length that is 1/2 the wavelength (T/F)

True

When you are moving toward a stationary source of a sound, its frequency will appear lower than it actually is (T/F)

False

The change in the direction of light as it passes through the boundary between two media is called refraction (T/F)

True

The angle of incidence is equal to the angle of refraction (T/F)

False

The slower light travels in a given media, the greater the index of refraction (T/F)

True

Longer wavelengths are affected more by a prism or water droplets than are the shorter wavelength (T/F)

False

The sky appears blue due to the light reflected from the oceans (T/F)

False

Ultraviolet light carries more energy than infrared radiation (T/F)

True

Through which medium will sound travel most rapidly?
A. vacuum
B. air
C. water
D. steel

A. vacuum

Sound waves in air
A. are longitudinal
B. are produced by something vibrating
C. undergo refraction when they pass through warm and cold air
D. all of the above

D. All the above

The time that is required from vibrating object to complete one full cycle is called
A. frequency
B. wavelength
C. amplitude
D. period

D. Period

Longitudinal waves with a frequency above 20,000 Hz are
A. impossible
B. supersonic
C. ultrasonic
D. infrasonic

C. ultrasonic

If v = wf, then how are w and f related?
A. w is directly proportional to f
B. w is inversely proportional to f
C. w is a factor of f
D. w and f are unrelated

w- wavelength

B. w is inversely proportional to f

Transverse mechanical waves can pass through
A. solids
B. liquids
C. gases
D. All of the above

A. Solids

In longitudinal waves, the medium
A. vibrates in a direction perpendicular to the direction of motion of the wave
B. vibrates in the same direction the wave is moving
C. moves in sort of a circular motion
D. doesn’t vibrate; the disturbance just moves through the medium

B. vibrates in the same direction the wave is moving

The characteristic of sound wave that you interpret as loudness is related to
A. frequency
B. wavelength
C. amplitude
D. velocity

C. amplitude

Reflected sound waves that are heard within 0.1s
A. undergo a gain in volume
B. make an echo
C. cause interference
D. make a beat

B. make an echo

Suppose that you hold a vibrating 340-Hz tuning fork near a guitar string that is vibrating at 350 Hz. What you heat is
A. two separate tones of different frequency
B. one tone with a frequency of 345 Hz
C. beats with a frequency of 10 Hz
D. one tone with a frequency of 690 Hz

C. Beats with a frequency of 10 Hz

What is the range of normal human hearing?
A. 200 to 120,000 Hz
B. 20 to 2,000 Hz
C. 50 to 10,000 Hz
D. 20 to 20,000 Hz

D. 20 to 20,000 Hz

Condensation in a longitudinal wave corresponds to what part of a transverse wave?
A. crest
B. trough
C. wavelength
D. amplitude

A. Crest

Resonance occurs at a (an)
A. natural frequency
B. intensity match
C. point of constructive interference
D. point of destructive interference

A. natural frequency

The higher the frequency of a sound wave
A. the higher the pitch
B. the longer the wavelength
C. the higher the velocity
D. the greater the amplitude

A. the higher the pitch

A noise level of 65 decibels is measured for
A. a whisper
B. a jet plane
C. normal conversation
D. a library

C. Normal Conversation

The bending of a wave at the boundary between two media is called
A. reflection
B. resonance
C. reverberation
D. refraction

D. refraction

The lowest frequency possible in a vibrating string undergoing resonance is
A. the fundamental frequency
B. determines the pitch of the musical note sounded
C. has one antinode
D. All of the above

A. the fundamental frequency

When the trough of one wave arrives at the same time and place as the crest of an otherwise identical wave
A. constructive interference occurs
B. destructive interference occurs
C. resonance occurs
D. they don’t interact with each other

B. destructive interference occurs

You are able to hear sounds from farther away on a cool night because sound waves are refracted toward
A. cooler air near the ground.
B. warmer air above the ground.
C. cooler air above the ground.
D. warmer air near the ground

D. warmer air near the ground