Question

A parabolic reflector antenna having a circular opening of
radius 0.35 m is used to focus sound

waves. Assume that the intensity level of a whisper is 20 dB at 1 m
from a speaker, and that the

threshold of hearing is 0 dB for which �C = 106K: W/m:. (i)
Determine the power of the acoustic

wave generated by a whisper. (ii) If the energy of a whispered
conversation is collected by the

parabolic antenna at a distance R from the speaker, find an
expression for the received power as a

function of R. (iii) If such power is delivered from the focus of
the reflector to the ear of a

listening detective through a tube of diameter 1.2 cm with 10%
efficiency. How far can a

whispered conversation be comprehended?

Answer #1

A
parabolic reflector antenna having a circular opening of radius
0.35 m is used to focus sound waves. Assume that the intensity
level of a whisper is 20 dB at 1 m from a speaker, and that the
threshold of hearing is 0 dB for which . (i) Determine the power of
the acoustic wave generated by a whisper. (ii) If the energy of a
whispered conversation is collected by the parabolic antenna at a
distance R from the speaker,...

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1.Suppose that a public address system emits
sound uniformly in all directions and that there are no
reflections. The intensity at a location 27 m away from the sound
source is 3.0 × 10-4 W/m2. What is the
intensity at a spot that is 74 m away?
2. A loudspeaker has a circular opening with...

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