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A siren with 20 holes in its disc given ...

A siren with 20 holes in its disc given 5 beats per second with a closed pipe sounding its fundamental note when the disc makes 2400 revolution per minute. What is the effective length of the pipe? (velocity of sound in air `= 360 ms^(-1)`)

Text Solution

Verified by Experts

The correct Answer is:
`11.18 xx 10^(-2)m " or " 11.32 xx 10^(-2) m`
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The disc of a siren has 100 holes and rotates at the rate of 1000 revolutions per mintue. Find the frequency and wavelength of the note emitted by the siren. (Velocity of sound in air = 350 m//s )

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Knowledge Check

  • A tuning fork vibrats with frequnecy 256 Hz and gives one beat per seond with the third normal mode of vibration of an open pipe. What is the length of the pipe (Speed of sound in air is 340 ms^(-1) )

    A
    190 cm
    B
    200 cm
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    220 cm
    D
    180 cm

  • Two closed organ pipes give 10 beats between the fundamental when sounded together. If the length of the shorter pipe is 1m then the length of the longer pipe will be (speed of sound in air is 340ms^(-1) )

    A
    `2.87 m`
    B
    `0.87 m`
    C
    `1.13 m`
    D
    `2.13 m`

  • A closed pipe of length 22 cm, when excited by a 1875 Hz source forms standing waves. The number of pressure nodes formed in the pipe are [velocity of sound in air = 330 ms^(-1) ]

    A
    1
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    2
    C
    4
    D
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    What is the fundamental frequency of an open organ pipe of length 42.5 cm, if the velocity of sound in air is 340 m/s?

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    A pipe of length 1.5 m closed at one end is filled with a gas and it resonates at 30^(@)C in its fundamental with a tuning fork. Another pipe of the same length but open at both ends and filled with air and it resonates in its fundamental with the same tuning fork. Calculate the velocity of sound at 0^(@)C in the gas, given that the velocity of sound in air is 360 m s^(-1) at 30^(@) .

    Two open organ pipes give 5 beats per second when sounded together in their fundamental modes.The lengths of the pipes are 1 m and 1.03 m .Find the velocity of sound.

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