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Loudspeakers can produce intense sounds with surprisingly
Chapter 17, Problem 29(choose chapter or problem)
Problem 29PE
Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low efficiencies. Calculate the power input needed to produce a 90.0-dB sound intensity level for a 12.0-cm-diameter speaker that has an efficiency of 1.00%. (This value is the sound intensity level right at the speaker.)
Questions & Answers
QUESTION:
Problem 29PE
Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low efficiencies. Calculate the power input needed to produce a 90.0-dB sound intensity level for a 12.0-cm-diameter speaker that has an efficiency of 1.00%. (This value is the sound intensity level right at the speaker.)
ANSWER:Solution 29PE
Loudspeaker helps in transmitting low sounds to higher volumes without compromising its quality.
The expression to find the speaker intensity level of sound transmitted is,
= (10 dB)
Substitute, 40 dB for and for in the expression of intensity level of sound,
40 dB = (10 dB) ()
= ()
Take antilog at base 10 both sides,