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When we start filling an empty bucket wi...

When we start filling an empty bucket with water, the pitch of sound produced goes on changing. Why?

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A bucket can be treated as a pipe closed at one end. The frequency of the note produced `=upsilon//4L` , where `upsilon` is velocity of sound in air and L is length of air column, which is equal to depth of water level from the open end. As the bucket is filled with water, L decreases. Therefore, frequency of sound produced goes on increasing.
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Knowledge Check

  • Assertion : When we start filling an empty bucket with water, the pitch of sound produced goes on decreasing. Reason : The frequency of man voice is usually higher than of woman.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true and reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion and reason both are false.

  • Assertion (A) : The pitch of the sound produced by the vibrating string can be changed. Reason (R) : The pitch of the sound can be changed by changing the length, tension and thickness of the vibrating string.

    A
    Both A and R are correct and R is the correct explanation of A.
    B
    Both A and R are correct but R is not the correct explanation of A.
    C
    A is correct and R is incorrect.
    D
    Both A and R are incorrect.

  • Assertion (A): The pitch of the sound produced by the vibrating string can be changed. Reason (R): The pitch of the sound can be changed by changing the length, tension and thickness of the vibrating string.

    A
    Both A and R are correct and R is the correct explanation of A.
    B
    Both A and R are correct but R is not the correct explanation of A.
    C
    A is correct and R is incorrect.
    D
    Both A and R are incorrect.

    • Similar Questions

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    The radius of a cylindrical cistern is 10 metres and its height is 15 metres. Initially the cistern is empty. We start filling the cistern with water through a pipe whose diameter is 50 cm. Water is coming out of the pipe with a velocity 5 m/s. How many minutes will it take in filling the cistern with water ?

    An empty plastic bottle closed with an airtight stopper is pushed down into a bucket filled with water. As the bottle is pushed down, there is an increasing force on the bottom as shown in graph . This is because

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