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A source emitting sound of frequency 180...

A source emitting sound of frequency 180 Hz is placed in front of a wall at a distance of 2m from it. a detector is also placed in front of the wall at the same distance from it. The minimum distance between the source and the detector is x mtrs for which the detector shows a maxima of sound. Speed of sound in air = 360 m/s

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Knowledge Check

  • A source emitting a sound of frequency V is placed at a large distance from an observer. The source starts moving towards the observer with a uniform acceleration a. Find the frequency heard by the oserver corresponding to the wave emitted just after the source starts. The speed of sound in the medium is v.

    A
    `(Vv^(2))/(2Vv-a)`
    B
    `(2V^(2)v)/(2Vv-a)`
    C
    `(2Vv)/(Vv-a)`
    D
    `(2Vv^(2))/(2Vv-a)`

  • source emitting a sound of frequency V is placed at a large distance from an observer. The source starts moving towards the observer with a uniform acceleration a. Find the frequency heard by the observer corresponding to the wave emitted just after the source starts. The speed of sound in the medium is v.

    A
    `(V v^2)/(2Vv - a)`
    B
    `(2V^2 v)/(2Vv - a)`
    C
    `(2Vv)/(Vv -a)`
    D
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  • A source .S. emitting a sound of frequency 300 Hz is fixed on block .A. while detector is fixed on block .B. detects the sound. The block .A. and .B. are simultaneously displaced towards each other through a distance of 1 m and then left to vibrate. If the velocity of sound in air is 340ms^(-1) and S , S_(A), S_(B) are identical the frequency of block A is 2Hz. Then

    A
    Maximum velocity of detector is `4pi ms^(-1)`
    B
    Maximum frequency detected by detector is 323 Hz (approximately)
    C
    Minimum frequency detected by detector is 278 Hz (approximately)
    D
    The phase difference between S and D is `pi/4`

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