Two identical machines are positioned the same distance from a worker. The intensity of sound delivered by each operating machine at the worker's location is `2.0xx10^-7(W)/(m^2)`. (a) Find the sound level heard by the worker when one machine is operating. (b) Find the sound level heard by the worker when both the machines are operating.

Two loudspeakers radiate in phase at 170 H_(Z) . An observer sits at 8 m from one speaker and 11 m from the other . The intensity level from either speaker acting alone is 60 dB . The speed of sound is 340 m//s . (a) Find the observer intensity when both speakers are on together. (b) Find the observer intensity level when both speakers are no together but one has its leads reversed so that the speakers are 180^(@) out of phase. (c ) Find the observer intensity level when both speakers are on and in phase but the frequency is 85 H_(Z) .

The intensity of sound from a radio at a distance of 2 metres from its speaker is 1xx10^(-2) mu W//m^(2) . The intensity at a distance of 10 meters would be

The intensity of sound from a radio at a distance of 2 metres from its speaker is 1xx10^(-2) mu W//m^(2) . The intensity at a distance of 10 meters would be

At a distance 20 m from a point source of sound the loudness level is 30 dB . Neglecting the damping, find (a) the loundness at 10 m from the source (b) the distance from the source at which sound is not heard.

At a distance 20 m from a point source of sound the loudness level is 30 dB . Neglecting the damping, find (a) the loundness at 10 m from the source (b) the distance from the source at which sound is not heard.

The sound intensity is 0.008W//m^( 2) at a distance of 10 m from an isotropic point source of sound. The power of the source is

The sound intensity is 0.008W//m^( 2) at a distance of 10 m from an isotropic point source of sound. The power of the source is