If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be
Increasing by a factor of 2
Decreasing by a factor of 2
Decreasing by a factor of 4
Unchanged
As we learnt in
Intensity of the wave -
mass density
angular frequency
Amplitude
Wave speed
- wherein
flow of energy per unit area of cross section of the string in the unit time is known as intensity of wave.
Intensity of sound
Option 1)
Increasing by a factor of 2
This option is incorrect.
Option 2)
Decreasing by a factor of 2
This option is incorrect.
Option 3)
Decreasing by a factor of 4
This option is correct.
Option 4)
Unchanged
This option is incorrect.