Waves Light Waves Sound Waves and Ultrasound

Waves Light Waves Sound Waves and Ultrasound
Waves Light Waves Sound Waves and Ultrasound
1. The amplitude of a wave is related to which of the following?
A. The distance between two successive crests
B. The number of wavelengths that pass by per second
C. The speed of the wave’s travel
D. The amount of energy it carries
Answer is D: The greater the amplitude, the greater the energy carried.
2. Which is the BEST definition of a wave?
A. The method by which the energy carried by visible light is propagated.
B. Travelling oscillations in the magnitude and direction of electric and magnetic fields that do not require a material medium.
C. A periodic disturbance in some property of the medium, the medium itself
remains (relatively) at rest.
D. A mechanism for the transfer of energy without the transfer of matter.
Answer is D: The other choices also describe a wave but not in the most general
terms.
Waves Light Waves Sound Waves and Ultrasound
3. What does the term “wavelength” mean when applied to a wave?
A. The number of complete cycles that passes by in 1 s
B. The distance between two successive crests (or compressions)
C. The time it takes for one wavelength to pass by
D. How fast a wave is moving in its direction of propagation
Answer is B: Wavelength is the shortest distance between two points that are displaying the same displacement.
4. The wave equation may be written in symbols as v = fλ where f stands for frequency, v stands for velocity and λ stands for wavelength. If a wave has a speed
of 3 × 108
m/s, what is its frequency and wavelength?
A. f = 10,000 Hz and λ = 0.0003 m
B. f = 5 × 1014 Hz and λ = 6 × 10−7
m
16 Waves, Light Waves, Sound Waves and Ultrasound (The Physics of)
495
C. f = 6 × 104
Hz and λ = 0.5 × 10−4
m
D. f = 2 MHz and λ = 3 × 105
m
Answer is B: Which combination of frequency and wavelength will give the speed
3 × 108
m/s?
v = fλ = 5 × 1014 Hz × 6 × 10−7
m = 30 × 1014–7 = 30 × 107
= 3 × 108
Waves Light Waves Sound Waves and Ultrasound
5. The wave equation may be written in symbols as v = fλ where f stands for frequency, v stands for velocity and λ stands for wavelength. If a wave has a speed
of 2 × 108
m/s, what is its frequency and wavelength?
A. f = 4 × 104
Hz and λ = 0.5 × 10−4
m
B. f = 5 × 1014 Hz and λ = 4 × 10−7
m
C. f = 10,000 Hz and λ = 0.0002 m
D. f = 2 MHz and λ = 1 × 105
m
Answer is B: Which combination of frequency and wavelength will give the speed
2 × 108
m/s?
v = fλ = 5 × 1014 Hz × 4 × 10−7
m = 20 × 1014–7 = 20 × 107
= 2 × 108
6. What name is given to the change in the observed frequency of a wave (or its
reflection) because of the motion of the source (or the reflecting object) or of the
observer?
A. The beat frequency
B. The red shift
C. Phase inversion
D. The Doppler effect
Answer is D: The change in frequency when the source of the (say) sound is in
motion relative to the observer is called the Doppler effect. (The red shift in astronomy is due to the Doppler effect.)
7. Which of the statements about sound and light is INCORRECT?
A. Sound is a mechanical wave, while light does not require a medium to travel
in.
B. Light is a transverse wave phenomenon, while sound is a longitudinal wave
phenomenon.
C. The speed of light is much greater than the speed of sound.
D. Ultrasound and ultraviolet light have frequencies less than infrasound and
infrared light.
Answer is D: In fact both ultrasound and ultraviolet light have frequencies
GREATER than infrasound and infrared light, respectively.
8. A wave may be defined as which of the following?
A. The oscillation of a particle of the medium
B. A series of crests and compressions that propagate through space
C. A mechanism for the transfer of energy without transferring matter
D. The transport of the medium due to the oscillation of its particles
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