Home
Class 11
PHYSICS
A spherical source of power 4 W and freq...

A spherical source of power `4 W` and frequency `800 Hz` is emitting sound waves. The intensity of waves at a distance `200 m` is

A

`8xx10^(-6)W//m^(2)`

B

`2xx10^(-4)W//m^(2)`

C

`1xx10^(-4)W//m^(2)`

D

`4W//m^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Intensity `(I)=("Power")/("Area")=(4)/(4pi(200)^(2))`
`=7.9xx10^(-6)W//m^(2)`
`~~8xx10^(-6)W//m^(2)`.
Promotional Banner

Similar Questions

Explore conceptually related problems

If a source sound of frequency 500 Hz produces waves of wavelength 0.1 m. Then the waves travel a distance of 300 m in the time in the time interval will be

A 10 W source of sound of frequency 1000 Hz sends out wave in air. The displacment amplitude a distance of 10 m from the source is (speed of sound in air = 340 m/s and density of air = 129 kg/m^(3) )

A source of frequency 500 Hz emits waves of wavelength 0.2 m . How long does it take to travel 300 m ?

An isotropic point source of sound waves is emitting sound waves of power 314 W in spherical wave fronts, If the sound source is located at the point ( 1 , 2 , 3 ), the intensity at point [ 4 , 6 , (3+5sqrt(3)) ], if all co-ordinates are measured in meters is :-

Intensity level at a distance 200 cm from a point source of sound is 80 dB. If there is it loss of acoustic power in air and intensity of threshold hearing is 10^-12 W m^-2 , then the intensity level at a distance of 4000 cm from source is (log 20 = 1.3)