Transcript Waves & Sound Test Review

Bell Work: Test Review
1. What is the range of human hearing?
2. How do bats find food?
3. The speed of a wave depends on the ____.
4. Sound waves travel fastest in ( solids / liquids
/ gasses ).
5. Sound waves travel fastest in ( cold / warm )
air.
Waves & Sound Test
Review
1.
Measurement:
Period
Variable (symbol):
T
Unit:
s
Length
L
m
Gravity
g
m/s2
Frequency
f
Hz

m
v
m/s
Wavelength
Speed
(velocity)
2. The distance between successive identical
parts of a wave is called its ( wavelength /
amplitude )
3. The time needed for a wave to make one
complete cycle is its ( wavelength / period ).
4. The amplitude of a particular wave is 2.0 m.
The top-to-bottom distance of the disturbance is
4.0m
5. How many wavelengths are traveled during a
single period by a wave? One
6. A loud sound always has more ( wavelength /
energy / speed ) than a quiet sound.
7. A node has ( zero / the most ) energy and an antinode has
( zero / the most ) energy.
8. Some of a wave's energy is always being dissipated as
heat. In time, this will reduce the wave's ( amplitude /
period ).
9. A weight on the end of a spring bobs up and down one
complete cycle every 2.0 seconds. Its frequency is
f = 1/T
f = ½;
f = .5 Hz
10.A weight on the end of a spring bobs up and down one
complete cycle every 4.5 seconds.
Its period is 4.5 seconds
11. What is the length of a pendulum that has a
period of 3.52 s?
L = 3.08 m
12. Sound waves cannot travel through (air / steel /
vacuum ).
13. Which kind of waves can travel through a vacuum?
Electromagnetic
14. When compared to the speed of light, sound travels
( slower / faster / the same ).
15. ( Speed / Frequency / Amplitude) is visibly different
when comparing transverse waves and longitudinal
waves.
16. If you double the frequency of a vibrating object, its
period ( doubles / halves / is quartered ).
17. For Transverse Waves, the disturbance is ( parallel /
perpendicular ) to the direction of propagation, and in
Longitudinal Waves, the disturbance is ( parallel /
perpendicular ) to the direction of propagation.
18. You dip your finger repeatedly into water and make
waves. If you dip your finger more frequently, the
wavelength of the waves ( lengthens / shortens /
stays the same ).
19. The period of an ocean wave is 20 seconds. What is
the wave’s frequency?
f = 1/T
f = 1/20
f = .05 Hz
20. A certain ocean wave has a frequency of
0.50 hertz and a wavelength of 10 meters. What
is the wave’s speed?
v =  ●f
v = .50 Hz x 10 meters
v = 5 m/s
21. Waves bouncing off a surface is an
example of ( reflection / refraction )
22. When 2 or more waves are in the same
place at the same time it is ( interference /
resonance )
23. When waves are amplified in a tube due to
energy added at regular time intervals is called
( interference / resonance )
24. Interference that decreases the amplitude of
a wave is ( constructive / destructive ).
25.Two waves arrive at the same place at the same
time exactly in step with each other. Each wave
has an amplitude of 3.0 m. The resulting wave
has an amplitude of
3+3=6m
26. A wave created by shaking a rope up and
down is called a (longitudinal / constructive /
transverse ) wave.
27. Sound is an example of a (longitudinal /
Doppler / transverse ) wave.
28. An train is coming towards you. The frequency
of the sound waves will ( decrease / increase ) as
the ambulance approaches.
29. What category of wave does NOT describe
sound?
a.longitudinal
b. mechanical
c. transverse
30. Sound waves are produced by (radio station
waves /objects under pressure / vibrating objects ).
31. The sound from a trumpet travels a 343 m/s in
air. If the frequency of the note is 512 Hz, what is
the wavelength of the sound wave?
Wavelength = v/f
Wavelength = 343/512
Wavelength = .67 m
32. A sound wave that has a higher frequency has a
wavelength that is (shorter / longer ).
33. The Doppler effect occurs when a source of
sound moves (toward you / away from you / both ).
34. As the sound of a car's horn passes and recedes
from you, the frequency of the horn seems to
( increase / decrease ).
35. When an ambulance is moving towards you, the
frequencies of the sound waves are (lower /higher )
and the wavelength is ( longer / shorter ).
36. The Doppler shift changes the ( frequency /
speed ) & ( amplitude / wavelength ) of a wave.
37. What is the Doppler effect?
The change in observed frequency due to the
motion of the source or observer.
38. An echo is heard in 6.5 seconds after “What’s
Up” is yelled down a canyon. How far did the
sound wave travel? (Assume temperature of air is
20o C)? (Use the t = d/v)
d=txv
d = 6.5 x 343 (speed of sound at 20o C)
d = 2229.5 m
39. Calculate the speed of sound in air that is 35OC.
V = 331 + .6 x Temp.
V = 331 + .6 x 35
V = 331 + 21 = 352 m/s
40. Which of the following would be most
likely to transmit sound with the highest speed?
a. Steel
b. wood
c. water
41. The speed of a sound wave depends on
the medium.
42.The phenomenon of beats results from
sound ( reflection / refraction/ interference ).
43. For sound, loudness is a measure of the
waves ( tone / amplitude / equilibrium ).
44. For sound, pitch measures the ( tone /
amplitude / frequency ) of the wave.
45. As the length of a tube increases, the
frequency it produces (decreases / increases ) and
the wavelength (decreases / increases ).
46. As the tension in a guitar string is lowered,
the frequency it produces (decreases / increases ).
47. If you blow across the top of a bottle with
more force, the frequency it produces (decreases /
increases / stays the same ) and the loudness of
the sound (decreases / increases / stays the same )
48. The Tacoma Narrows Bridge collapsed due to
( beats / destructive interference / resonance ).
49. Five people playing the drums is louder than
one because of (constructive / destructive )
interference.
50. A human’s perception of the amplitude of a
sound wave is the ( pitch / vibration / loudness ).
51. Listen for these louder and quieter
oscillations of sound to disappear when tuning an
instrument.
a.
Loudness
c. Vibration
b.
Resonance
d. Beats
52. The range for audible sound is from 20 Hz to
( 2000 / 20,000 / 200,000 ) Hz.
53. Sound waves are too low to hear are
(infrasonic / ultrasonic ) and sound waves are
too high to hear are (infrasonic / ultrasonic ).
54. Bats use ( infrasonic / ultrasonic ) and (radar
/ echolocation ) to locate their next meal.
55. ( Sonar / Radar ) uses echoing sound waves
to locate objects and determine how far away
they are.