Physics 112 Quiz 1 Ch 16
Physics chapter 16 quiz. Study for test please.
- 1.A source emits a sound of constant frequency, f. If this sound enters an environment where the speed of sound is greater f stays the same and:
- A.
Lambda becomes longer.
- B.
Lambda becomes shorter.
- C.
Lambda stays the same if f is unchanged.
- D.
No. the speed of sound is a "constant" so f must change along with lambda.
- E.
No. the speed of sound, wavelength and frequency will all be unchanged.
- 2.A singer practicing the vocal scale singing "do, re,mi,fa,so,la,ti,do" produces sounds
- A.
At progressively longer lambda and lower frequency
- B.
At progressively shorter lambda and lower frequency
- C.
At progressively longer lambda and higher frequency
- D.
At progressively shorter lambda and higher frequency.
- E.
At progressively higher frequencies but constant wavespeed and wavelength.
- 3.The wavelength emitted during a persons speech depend on several factors, including the dimensions of their mouth and related cavities. if a person has inhaled helium gas, the speed of the sound waves through this helium gas will be > so when they speak, the same wavelengths and this greater sound speed result in speech at frequencies that are
- A.
Lower than for their normal speech in air
- B.
The same as for their normal speech in air.
- C.
Greater than for their normal speech in air
- D.
Unable to be heard by stationary observers
- E.
More than one of these is correct
- 4.At a fireworks display an exploding aerial bomb produces a sound intensity of 1.0E-2 w/m at a distance of 100 m from the explosion. the surface area for a sphere is 4pie R^2. what would be the total power output of this explosion, assuming it is uniform and unfocussed.
- A.
3.2E-7 W
- B.
1.0E-2 W
- C.
3.1E2 W
- D.
1.3E3 W
- E.
None of these
- 5.To have resonance and a standing wave on the sting of a violin or guitar, for the displacement of the string there should be
- A.
Nodes at both ends
- B.
Loops or antinodes at both ends
- C.
A loop or antinode at one end and a node at the other end.
- D.
Nodes but no loops or antinodes since this motion would destroy the standing wave.
- E.
None of these
- 6.While drinking soda from a bottle, you pause periodically and irritate the people around you by blowing across the top of the bottle to make it toot. the more soda you have removed:
- A.
The lower the pitch of the resulting sound
- B.
The higher the pitch of the resulting sound
- C.
The pitch stays the same the stand waves just get longer
- D.
The pitch stays the same the standing waves just get shorter
- E.
None of these
- 7.Ultrasound refers to sound waves of very
- A.
High intensities
- B.
High frequencies
- C.
Long wavelengths
- D.
All of these
- E.
None of these
- 8.When you hold a seashell to your hear the "sound of the sea" can be heard. this is due to the:
- A.
Marine environment in which the shell was formed
- B.
Shell blocking all other sound from reaching you.
- C.
Action of this shellular telephone that transmits sounds from distant shores to you.
- D.
Sounds whose intensities are too small to be audible under normal conditions are enhanced by reflection within the shell producing noise like the ocean.
- E.
Sounds whose intensities are too small to be audible under normal conditions are enhanced by transmission through the solid walls of the shell, producing noise like the ocean.
- 9.The external auditory canal of the human ear is about .027 m long with diamier of .007 m. If this is approximated as atube, closed at one end, with sound waves speed of 344 m/s this tube would have a resonant frequency of:
- A.
0.027 m
- B.
Less than 10 hz
- C.
3.2E3 hz
- D.
6.4E3 hz
- E.
1.3E4 hz
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