Physics: Doubling the intensity of sound (MC)

Question

Doubling the intensity of sound:

 

a. Doubles the sound level.

b. Increases sound level by factor of √2 .

c. Increases sound level by 3 dB.

Answer 1

Since I(dB) = 10 log(I/I₀), then if I → 2I, then you are increasing the sound level by 10[log 2 + log(I/I₀)   =  3db