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Sound Part 2
Test Description: Other topics
Instructions: Answer all questions to get your test result.
1) What is characteristic of the Doppler effect?
A
the bending of waves due to a change in the speed of the medium
B
apparent increase in frequency when the source is approaching an observer
C
synonymous to the law of superposition
D
the ability of waves to bend past small obstacles and go through small holes
2) What is an incident pulse?
A
Original disturbance that encounters the boundary or obstacle within the medium
B
Happens during reflection of waves
C
Follows a change in direction of wave
D
All of the above
3) What happens during in reflection from a hard boundary?
A
a small amount of energy is transferred to the pole, thus causing the pole to vibrate
B
All of the above
C
Leftover energy causes the wave to bounce off the pole and continue traveling in the opposite direct
D
Reflected wave is inverted
4) What happens during reflection from a soft boundary?
A
Wavelength changes direction
B
Reflected wave is inverted
C
Velocity changes direction
D
the wave does not transfer energy to the pole
5) Is the levitation of water possible?
A
No, the video has been altered
B
Yes, the water does take the certain forms
C
No, THERE ARE NO WATERBENDERS
D
It is merely a trick of the camera
6) What is a principle of diffraction?
A
A and B only
B
Sound will bend around certain small obstacles and spread out past openings
C
Observed in a change in direction of waves as they are passing through an opening or barrier
D
Sound is distorted when traveling large distances
7) Which way will sound refract during a temperature lapse(air warmest close to ground)?
A
Not at all
B
Straight
C
Upwards
D
Downwards
8) Which way will sound refract during a temperature inversion?
A
Upwards
B
Downwards
C
Straight
D
Not at all
9) How do we perceive music?
A
as a series of random noises
B
As sound particles that can be decoded
C
a mixture of sound waves that have different frequencies
D
a mixture of frequencies that do not have an obvious mathematical relationship and no pattern
10) what is not a characteristic of a beat
A
amplitude is changing at a regular rate
B
two waves of similar frequencies interfere with one another
C
a fast tempo being taken by the musician
D
periodic and repeating fluctuations
*select an answer for all questions
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