question about sound intensity

Atheist

2010-12-26 6:24 pm

1) Sound intensity = power/area

2) Energy = 0.5mw^2 A^2, where m=mass, w=angular frequency and A=amplitude

3) w=2pi f, f=frequency

Question: Is is true that the sound intensity at a point is directly proportional to the square of the frequency of the source?(when the distance from the source and the amplitude are constant.)
Furthermore, is it true that the loundness and the pitch both depend on frequency of the source?

回答 (1)

天同

2010-12-27 6:01 am

✔ 最佳答案

Question: Is is true that the sound intensity at a point is directly proportional to the square of the frequency of the source?

It is obvious that a mass of air vibrating at a higher frequency possesses higher energy. The sound intensity (energy per unit area) thus depends on the frequency of the wave.

Q: Furthermore, is it true that the loundness and the pitch both depend on frequency of the source?

Be aware that loudness of sound is not proportional to sound intensity because of the reason that the sensation of human ear is not linear. The ear is more sensitive to sound frequencies around a few thousand Hz. Please refer to the following web-page for "equal loudness curves"

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/eqloud.html

Pitch of a sound depends on the frequency. Normally, a higher frequency sound gives a high pitch sensation.

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