FINAL: CH7 Flashcards
1
Q
When we consider the time taken for a pendulum to swing to and from we're talking about the pendulum's A.) frequency B.) period C.) wavelength D.) amplitude
A
B.) period
2
Q
When we consider the distance a pendulum swings and from we're talking about the pendulum's A.) frequency B.) period C.) wavelength D.) amplitude
A
D.) amplitude
3
Q
If the frequency of a certain wave is 10Hz, its period is A.) 0.1s B.) 10s C.) 100s D.) none of the above
A
A.) 0.1s
4
Q
A 60 vibration per second wave travels 30m in 1s. Its frequency is
A.) 30Hz and it travels at 60 m/s
B.) 60Hz and it travels at 30 m/s
C.) neither
A
B.) 60Hz and it travels at 30 m/s
5
Q
A weight suspended from a spring bobs up and down one complete cycle every 2s. Its frequency is A.) 0.5 Hz B.) 1 Hz C.) 2 Hz D.) none of the above
A
A.) 0.5 Hz
6
Q
If you double the frequency of a vibrating object, its period
A.) doubles
B.) is half
C.) is one quarter
A
B.) is half
7
Q
The pendulum with the greatest frequency has the A.) shortest period B.) shortest length C.) both D.) neither
A
C.) both
8
Q
A wave travels an average distance of 6m in 1s. What is the wave's velocity? A.) less than 0.2 m/s B.) 1 m/s C.) 3 m/s D.) 6 m/s E.) more than 6 m/s
A
D.) 6 m/s
9
Q
A floating leaf oscillates up and down 2 complete cycles in 1s as a water wave of wavelength 10m passes by. What is the wave's speed? A.) 2 m/s B.) 10 m/s C.) 20 m/s D.) 40 m/s E.) more than 40 m/s
A
C.) 20 m/s
10
Q
Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 MHz i s A.) 0.3m B.) 3.0m C.) 30m D.) 300m E.) none of the above
A
B.) 3.0m
11
Q
A skipper on a boat notices wave crests passing the anchor chain ever 5s. The skipper estimates the distance between crests is 15m. What is the speed of the water waves? A.) 3 m/s B.) 5 m/s C.) 15 m/s D.) not enough information
A
A.) 3 m/s
12
Q
A wave travels an average distance of 1m in 1s with a frequency of 1Hz. Its amplitude is A.) less than 1m B.) 1m C.) more than 1m D.) not enough information
A
D.) not enough information
13
Q
In a longitudinal wave, the compressions and rarefactions travel in
A.) the same direction
B.) opposite directions
C.) neither
A
A.) the same direction
14
Q
Which of the following is not a transverse wave? A.) sound B.) light C.) radio D.) all of the above E.) none of the above
A
A.) sound
15
Q
The vibrations of a transverse wave move in a direction
A.) along the direction of wave travel
B.) at right angles to the direction of wave travel
C.) opposite to wave travel
A
B.) at right angles to the direction of wave travel
16
Q
The vibrations of a longitudinal wave move in a direction
A.) along the direction of wave travel.
B.) at the right angles to the direction of wave travel
C.) opposite to wave travel.
A
A.) along the direction of wave travels
17
Q
Compressions and rarefactions normally travel A.) at right angles to the wave B.) in the same direction in a wave C.) in opposite directions in a wave D.) none of the above E.)
A
B.) in the same direction in a wave
18
Q
A sound source of high frequency emits a high A.) speed B.) amplitude C.) pitch D.) all of the above E.) none of the above
A
C.) pitch
19
Q
The range of human hearing is about A.) 10Hz-10,000Hz B.) 20Hz-20,000Hz C.) 40Hz-40,000Hz D.) all of the above, depending on the person E.)
A
B.) 20Hz-20,000Hz
20
Q
Our ears are best at hearing A.) infrasonic sound B.) ultrasonic sound C.) both D.) neither
A
D.) neither
21
Q
Sound waves cannot travel in A.) air B.) water C.) steel D.) a vacuum
A
D.) a vacuum
22
Q
The speed of a sound wave in air depends on A.) its frequency B.) its wavelength C.) the air temperature D.) all of the above E.) none of the above
A
C.) the air temperature
23
Q
Sound travels faster when the air is
A.) warm
B.) cold
C.) neither
A
A.) warm
24
Q
A 340-Hz sound wave travels at 340 m/s in air with a wavelength of A.) 1m B.) 10m C.) 100m D.) 1000m E.) none of the above
A
A.) 1m
25
```
An explosion occurs 34km away. For sound that travels at 340 m/s, you'll hear the explosion in
A.) 0.1s
B.) 1s
C.) 10s
D.) 20s
E.) more than 20s
```
E.) more than 20s.
26
```
A general rule for estimating the distance in kilometers between an observer and a lightning bolt is to count the number of seconds between seeing the lightning and hearing it, and dividing it by
A.) 2
B.) 3
C.) 4
D.) 5
E.) none of the above
```
B.) 3
27
Sound energy that is not reflected is
A.) transmitted
B.) absorbed
C.) either or both
C.) either or both
28
```
Ultrasonic sound that travels at 1530m/s in ocean water is bounced off the ocean floor and returns to the ship above. If the round trips makes 3s, the depth of the water is
A.) 1530m
B.) 2295m
C.) 3060m
D.) 4590m
```
B.) 2295m
29
```
The natural frequency of an objects depends on its
A.) elasticity
B.) size and shape
C.) both
D.) neither
```
C.) both
30
```
Resonance occurs when a 200-Hz tuning fork encounters a sound wave with a frequency of
A.) 150Hz
B.) 200Hz
C.) 300Hz
D.) any of the above
E.) none of the above
```
B.) 200Hz
31
```
Some singers are able to shatter a crystal chandelier with their voice, which illustrates
A.) an echo
B.) sound refraction
C.) beats
D.) resonance
E.) interference
```
D.) resonance
32
```
The phenomenon of beats results from sound
A.) refraction
B.) reflection
C.) interference
D.) all of the above
E.) none of the above
```
C.) interference
33
```
When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of the radio station, which illustrates
A.) forced vibrations
B.) resonance
C.) beats
D.) reverberation
E.) wave interference
```
B.) resonance
34
```
What beat frequency is produced when a 240-Hz and a 246-Hhz tuning fork are sounded together?
A.) 6Hz
B.) 12Hz
C.) 240Hz
D.) 245Hz
E.) none of the above
```
A.) 6Hz
35
```
The Doppler effect is characteristic of
A.) water waves
B.) sound waves
C.) light waves
D.) all of the above
E.) none of the above
```
D.) all of the above
36
```
For light, a red shift indicates the light sources moves
A.) toward you
B.) away from you
C.) at right angles to you
D.) all of the above
E.) none of the above
```
B.) away from you
37
```
The pitch of a musical sound depends on the sound waves
A.) wavelength
B.) frequency
C.) speed
D.) amplitude
E.) all of the above
```
B.) frequency
38
```
The loudness of a musical sound is a measure of the sound waves
A.) wavelength
B.) frequency
C.) speed
D.) amplitude
E.) all of the above
```
D.) amplitude
39
```
The quality of a musical note has to do with its
A.) loudness
B.) frequency
C.) harmonics
D.) amplitude
E.) all of the above
```
C.) harmonics
