The sound from a trumpet radiates uniformly in all directions in [math]20^{\circ} C[/math] air. At a distance of 5.00 m from the trumpet the sound intensity level is 52.0 dB. The frequency is 587 Hz. (a) What is the pressure amplitude at this distance? (b) What is the displacement amplitude? (c) At what distance is the sound intensity level 30.0 dB?
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Ответ:
Part a)
Pressure amplitude is
Part b)
displacement amplitude is given as
Part c)
Distance at the other intensity is
Explanation:
Part a)
As we know that intensity of sound at 5 m distance is 52 dB
so we have
now we have
Now we know that speed of sound at 20 degree C is given as
Now we know the relation of intensity of wave and pressure amplitude as
Part b)
Now displacement amplitude with pressure amplitude is related as
now bulk modulus of air is given as
also we know that
now we have
so we have
Part c)
As we know that intensity is inversely depends on the square of the distance
so we will have
Ответ: