SOUND WAVES QUIZ:
NAME: __________________________ PERIOD ______________
An automatic focus camera is able to focus on objects by use of an ultrasonic sound wave. The camera
sends out sound waves that reflect off distant objects and return to the camera. A sensor detects the time
it takes for the waves to return and then determines the distance an object is from the camera. A sound
wave (speed = 340 m/s) returns to the camera 0.150 seconds after leaving the camera,
1.
a.
b.
c.
d.
How far away is the object?
(340)(.15)
340/.15
340(.15/.5)
.15/340
2.
Water is 4 x as dense as air, if the sound
returned underwater in a time of 1 second how far was
the object?
a.
2720 m (4x340)//(1/2)
b.
.6 m
c.
340 m
d.
Distance cannot be determined
On a hot summer day, a pesky little mosquito produced its warning sound near your ear. The sound is
produced by the beating of its wings at a rate of about 600 wing beats per second. Sound travels at a
speed of 340 m/s.
3. What is the frequency in Hertz of the sound wave?
a. 1.76 htz
b. .56 htz
c. 2.0 X 105 htz
d. 6.00 X 102 htz
5. At 0°C sound travels through air at a speed of 330
m/s. If a sound wave is produced with a wavelength of
0.10 m, what is the wave’s frequency? 330/.1
4. What is the wavelength of the wave? 340/600
a. .56 cm
b. 56cm
c. 560 cm
d. 5m
6. A musician strums a guitar string causing all the
wood in the guitar to vibrate at the same frequency as
the string, this is an example of:
A 0.0033 Hz B 33 Hz
a. Doppler b. Resonance c. Interference d.
Harmony
C 330 Hz D 3300 Hz
7. Which illustration best demonstrates compression waves?
A
C
B
D
A police car drives at 30 m/s toward the scene of a crime, with its siren blaring at a frequency of 2000 Hz.
Assume the speed of sound is 343 m/s.
8. At what frequency do people hear the siren as it approaches? 2000(343/(343-30)=2191 Hz
9. How would the sound change if the car doubled its speed? 2000(343/(343-60)=2424 Hz
10. What is the wavelength of the sound as it leave the siren?343/2000= .172 m
11. Explain how resonance, frequency, wavelength, and air temperature effect a band making music.
SOUND WAVE INTERACTION QUIZ RETAKE
(Approaching) Fdopper= f(speed of sound/ speed of sound- speed of motion)
(Leaving) Fdopper= f(speed of sound/ speed of sound+ speed of motion)
1. Give Examples of the following:
a. Resonance
b. Constructive Interference
c. Doppler Effect
d. Longitudinal Wave
The marching band was moving at a speed of 5 m/s during the parade.
The trumpeter make a note with a frequency of 3400 htz. It took 2
seconds to reach your ear but it had a different sound. Sound is moving at
320 m/s this day due to a cold front.
2. What was the frequency of the sound as the trumpeter approached
you:
3. What was the frequency of the sound as the trumpeter passed by
you:
4. What was the wavelength of the original sound:
5. If it took the sound 2 seconds to reach you how far away was the
trumpet:
6. How long will it take the trumpeter to reach you: