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A police car moving at 22m//s, chases m...

A police car moving at `22m//s`, chases motorcyclist. The police man sounds his horn at `176 Hz`, while both of them move towards a ststionary siren of frequency `165 Hz`. Calculate the speed of the motorcycle, if it is given that he does not observes any beats.

A

`33m//s`

B

`22m//s`

C

`zero`

D

`11m//s`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) `f_(1) = frequency of the police car heard by motorcyclist`,
`f_(2) = frequency of the siren heard by motorcyclist`.
`f_(1) = (330-v)/(330 - 22) xx 176` , `f_(2) = (330 + v)/(330) xx 165` ,
`because` `f_(1) - f_(2) = 0 rArr v = 22 m//s`
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A police car moving at 22 m/s, chases a motorcylist. The police man sounds his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of the motorcycle, if it is given that he does not observes any beats

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Knowledge Check

  • A police car moving at 22m//s , chases a motorcyclist, the police man sounds his horn at 176 Hz , while both of them move towards a stationary siren of frequency 165 H z. Calculate the speed of the motorcycle, if it is given that he does not observes any beat

    A
    `33 m//s`
    B
    `22m//s`
    C
    zero
    D
    `11 m//s`

  • A police car moving at 22m/s chases a motorcyclist. The police man sounds his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of the motorcycle. If it is given that the motorcyclist does not observe any beats:

    A
    `33m//s`
    B
    `22m//s`
    C
    zero
    D
    `11m//s`

  • A police car moving at 30 ms^(-1) , chases a motarcyclist. The policemen sounds his horn at 180 Hz, while both of them move towards a stationary siren of frequency 160Hz. Calculate the speed of the motorcyclist , if it is given that he does not observes any beats (take the speed of sound = 330 ms^(-1))

    A
    `2 ms^(-1)`
    B
    `30 ms^(-1)`
    C
    `35.02 ms^(-1)`
    D
    `40 ms^(-1)`

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