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:
Options:
Answer:
A
Solution:
Gain = $10 log_{10} (400/20) = 10 log 20 = 13$ dB.

Question

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:

Options:

Answer:

A

Solution:

Gain = $10 log_{10} (400/20) = 10 log 20 = 13$ dB.

TestHub · Accepted Answer

Gain = 10 log 10 ​ ( 400/20 ) = 10 log 20 = 13 dB.

Physics - Sound Wave Question with Solution | TestHub

Options:

Doubts & Discussion