The Sound Test consists of 23 questions. Correct answers will be provided after your answers have been submitted. If they are available, possible solutions can be accessed by clicking an additional link at the bottom of the answer, which will open a problem solution screen. If you bring up such a solution screen be sure to close it by clicking the button in the upper left corner or upper right corner.

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1		If you increase the energy that goes into starting a vibration, you will increase the
			A)	frequency.
			B)	amplitude.
			C)	number of cycles per second.
			D)	wavelength.
2		The time required for one cycle of any repeating event is called one
			A)	hertz.
			B)	period.
			C)	frequency.
			D)	amplitude.
3		The time for needed one cycle and the frequency of a vibration have a relationship of the frequency varying
			A)	directly with the time.
			B)	directly with the square of the time.
			C)	inversely with the time.
			D)	inversely with the square of the time.
4		A longitudinal wave causes particles of a material to move
			A)	back and forth in the same direction the wave is moving.
			B)	perpendicular to the direction the wave is moving.
			C)	in a circular motion in the direction the wave is moving.
			D)	in a circular motion opposite the direction the wave is moving.
5		A transverse wave causes particles of a material to move
			A)	back and forth in the same direction the wave is moving.
			B)	perpendicular to the direction the wave is moving.
			C)	in a circular motion in the direction the wave is moving.
			D)	in a circular motion opposite the direction the wave is moving.
6		Sound waves travel faster in
			A)	air as compared to solids.
			B)	liquids as compared to solids.
			C)	warm air.
			D)	cool air.
7		You hear a higher pitch when a sound wave has a greater
			A)	amplitude.
			B)	velocity.
			C)	frequency.
			D)	wavelength.
8		The extent of displacement of a vibrating tuning fork is related to the resulting sound wave characteristic of
			A)	frequency.
			B)	amplitude.
			C)	wavelength.
			D)	period.
9		Sound waves cannot travel through
			A)	solid metal.
			B)	heavy, dense liquids.
			C)	a vacuum.
			D)	any of these.
10		Both constructive and destructive interference is necessary to produce the sound phenomena known as
			A)	resonance.
			B)	refraction.
			C)	beats.
			D)	diffusion.
11		An efficient transfer of energy that takes place at a natural frequency is known as
			A)	resonance.
			B)	beats.
			C)	the Doppler effect.
			D)	reverberation.
12		During a track and field meet, the time difference between seeing the smoke from a starter's gun and hearing the "bang" would be less
			A)	on a warmer day.
			B)	on a cooler day.
			C)	if a more powerful shell is used.
			D)	if a less powerful shell is used.
13		The driver of a car sounds the horn and hears a continual pitch while an observer hears a lower pitched horn. This means the car
			A)	has a defective horn.
			B)	is moving faster than the speed of sound.
			C)	is moving toward the observer.
			D)	is moving away from the observer.
14		How fast would you expect a 1.27 m sound wave with a frequency of 260 Hz to move?
			A)	204.7244 m/s
			B)	330 m/s
			C)	210 m/s
			D)	0.0049 m/s
15		The average human ear is most sensitive to 2,500.0 Hz sounds. Assuming sound to move at 334 m/s, what is the wavelength of sounds people are most sensitive?
			A)	7.5 cm
			B)	835 cm
			C)	13.4 cm
			D)	0.7485 m
16		What is the frequency of water waves if a new crest is observed to move by a bridge every 2 seconds?
			A)	0.5 Hz
			B)	1/15 Hz
			C)	2 Hz
			D)	5 Hz
17		What is the velocity of sound in ft/s when the air temperature is 30.0° C?
			A)	1087 ft/s
			B)	1089 ft/s
			C)	1119 ft/s
			D)	1147 ft/s
18		An echo is heard exactly 1.00 s after a sound when the air temperature is 30.0 C. How many feet away is the reflecting surface?
			A)	575 ft
			B)	1150 ft
			C)	1147 ft
			D)	1087 ft
19		If the air temperature is 90.00° F, how many seconds will elapse between seeing lightning and hearing the thunder if the lightning strikes one mile (5280.0 feet) away?
			A)	1269 s
			B)	4.162 s
			C)	4.587 s
			D)	4.858 s
20		What is the frequency of a tuning fork that resonates with an air column in a 24.0 cm closed tube with an air temperature of 20.0° C?
			A)	343 Hz
			B)	357 Hz
			C)	345 Hz
			D)	329 Hz
21		What are the fundamental frequency and the frequency of the first overtone of a 70.0 cm closed organ pipe?
			A)	123/368 Hz
			B)	343/1029 Hz
			C)	118/355 Hz
			D)	123/369 Hz
22		What is the fundamental frequency of a 0.5 m string if wave speed on the string is 400 m/s?
			A)	400 Hz
			B)	331 Hz
			C)	200 Hz
			D)	131 Hz
23		A tuning fork is found to resonate with an air column closed at one end when the tube is 60.0 cm long. If the air is 20.0° C, the speed of sound in air is 343 m/s. What is the frequency of the tuning fork?
			A)	143 Hz
			B)	286 Hz.
			C)	138 Hz
			D)	572 Hz