What are the ending materials produced from cell respiration
2 answers:
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Answer:
intensity of sound at level of microphone is 0.00139 W / m 2
sound intensity level at position of micro phone is 91.456 dB
EXPLANATION:
Given data:
power of sound P = 31 W
distance betwen microphone & speaker is 42 m
a) intensity of sound at microphone is calculated as
= 0.00139 W / m 2
b) sound intensity level at position of micro phone is
where I_o id reference sound intensity and taken as
= 91.456 dB