Sound from a point isotropic source spre...

Sound from a point isotropic source spreads equally in all directions in homogeneous medium. Therefore its intensity decreases with square of distance from the source. When distance between observer and the source changes, apart from changes in intensity, the observer listens sound of pitch higher or lower than actual pitch depending upon the fact that the distance between the observer and source is decreasing or increasing respectively. An observer O is at a distance 2R from centre of a circle of radius R. A point isotropic sound source S moves on the circle with uniform angular velocity`omega = pi//3 " rad"//s`. Initially observer, source and centre of the circle are in same line.

Starting from initial moment, the source moves through an angular displacement `180^(@)`. Intensity of the sound as observed by the observer decreases by a factor of –

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Sound from a point isotropic source spreads equally in all directions in homogeneous medium. Therefore its intensity decreases with square of distance from the source. When distance between observer and the source changes, apart from changes in intensity, the observer listens sound of pitch higher or lower than actual pitch depending upon the fact that the distance between the observer and source is decreasing or increasing respectively. An observer O is at a distance 2R from centre of a circle of radius R. A point isotropic sound source S moves on the circle with uniform angular velocity omega = pi//3 " rad"//s . Initially observer, source and centre of the circle are in same line. During a complete round trip of star on the circle, the observer listens a sound, whose –

Sound from a point isotropic source spreads equally in all directions in homogeneous medium. Therefore its intensity decreases with square of distance from the source. When distance between observer and the source changes, apart from changes in intensity, the observer listens sound of pitch higher or lower than actual pitch depending upon the fact that the distance between the observer and source is decreasing or increasing respectively. An observer O is at a distance 2R from centre of a circle of radius R. A point isotropic sound source S moves on the circle with uniform angular velocity omega = pi//3 " rad"//s . Initially observer, source and centre of the circle are in same line. Sound emitted by the source at two successive instants t_(1) and t_(2) has minimum and maximum observed pitch respectively, then –

If the distance between the observer and source decresase with time, then it show that

If the distance between the observer and source decreases with time, then it shows that

Intensity of sound at a point is its distance from the source

If the distance between the source and the observer is doubled,the intensity of sound becomes

Pitch .............. (does not/does) depend on the distance between the listener and the source.

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