Download Sample Questions over Waves and Sound ___ 1. The speed of any

Sample Questions over Waves and Sound
___ 1. The speed of any mechanical wave as it propagates through a medium is dependent mainly on
the
a. frequency of the wave source
b. wavelength
c. period of the wave
d. type of medium through which the wave travels
e. amplitude
____ 2. The shortest time interval in which a wave motion completely repeats itself (i.e., makes one
complete vibration or oscillation) is called the
a. amplitude
d. frequency
b. period
e. speed
c. wavelength
____ 3. A transverse wave has an amplitude of 2.4 m. What is the vertical distance, in meters, between
the top of a crest and the bottom of a trough?
a. 0.60
d. 3.6
b. 1.2
e. 4.8
c. 2.4
____ 4. In a longitudinal wave,
a. The particles move parallel to the direction of the wave motion.
b. The particles move perpendicular to the direction of the wave motion.
c. Energy causes the particles to move forward with the wave.
d. Energy is propagated by crests and troughs.
e. The speed is unaffected by the type of medium used.
____ 5. In an ideal wave, which of the following wave properties does not change as it travels along the
same medium?
a. amplitude d. period
b. wavelength e. all of the above
c. frequency
____ 6. Waves that are produced on a guitar string by plucking it are
a. light waves
d. acoustic waves
b. longitudinal waves
e. transverse waves
c. electromagnetic waves
____ 7. Consider the following wave properties:
(i) speed
(ii) frequency
(iii) wavelength
(iv) period
Which of the above quantities does not change as a wave changes mediums?
a. (i) only
d. (i) and (iv) only
b. (ii) only
e. (i), (ii), (iii), (iv)
c. (i) and (iii) only
____ 8. Two waves have frequencies of 44 Hz and 54.2 Hz, how many beats per second are produced.
a. 9.8
b. 10
c. 10.2
d. 44
e. 54.2
____ 9. A closed end pipe produces which harmonics?
a. 1, 2, 4.
b. 1, 2, 3.
c. 1, 3, 5.
d. 2, 4, 6
e. 3, 4, 5
____ 10. Which wave property most affects the intensity or loudness of sound?
a. reflection
d. distance from source
b. complexity
e. speed
c. frequency
____ 11. Which of the following frequencies is ultrasonic?
a. 12 Hz
d. 5000 Hz
b. 25 Hz
e. 25 000 Hz
c. 332 Hz
____ 12. The change in direction of a sound wave as it hits an end and bounces back?
a. diffraction
d. interference
b. refraction
e. resonance
c. reflection
____ 13. An ambulance is approaching a stationary observer. For the observer, the apparent frequency
of the siren compared to the actual frequency of the siren
a. there is no frequency to be heard
b. resonates
c. decreases
d. stays the same
e. increases
____ 14. One sound source has an intensity of 40 dB, while another has an intensity of 70 dB. The
intensity of these two differs by a factor of
a. 3
d. 2800
b. 30
e. 1030
c. 1000
____ 15. Which of the following frequencies is infrasonic?
a. 12 Hz d. 5000 Hz
b. 25 Hz e. 25 000 Hz
c. 332 Hz
____ 16. Which of the following intensities is 100 times greater than 10 dB?
a. –90 dB
d. 110 dB
b. 0 dB
e. 1000 dB
c. 30 dB
____ 17. The frequency of a sound wave is 50 Hz. What is its period?
a. 0.20 s
d. 0.020 m/s
b. 0.020 s
e. 50 s
c. 0.020 Hz
____ 18. During constructive interference in sound, which of the following could be produced?
a. louder sound
d. resonance
b. node
e. nothing
c. quieter sound
____ 19. When measuring the speed of sound outdoors, it is generally
a. fastest in the spring
b. fastest in the summer
d. fastest in the winter
e. the same for all seasons
c. fastest in the autumn
____ 20. A standing wave is produced on a string that is 3meters in length. What is the wavelength for
the 3rd harmonic
a. 6m
b. 3m
c. 2m
d. 1m
e. 0.5m