Questions
The power of a sound from the speaker of a radio is 20 mW. By turning the knob of the volume control, the power of the sound is increased to 400 mW. The power increase in decibels as compared to the original power is
detailed solution
Correct option is A
P∝IL1=10log10I1I0 and L2=10log10I2I0So L2−L1=10log10I2I1=10log10P2P1=10log1040020=10log1020=10log(2×10)=10(0.301+1)=13 dBTalk to our academic expert!
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Two loud speakers are being compared, and one is perceived to be 32 times louder than the other. What will be the difference in intensity levels between the two when measured in decibels?
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