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Question
Give two examples of forced vibrations.
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Solution
(i) The vibrations produced in the board of a guitar when its string is made to vibrate.
(ii) The vibrations produced in the tabletop when the stem of a vibrating tuning fork is pressed against it.
RELATED QUESTIONS
How does the medium affect the amplitude of free/natural vibrations of a body?
Give one example to illustrate forced vibrations.
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In following figure shows A, B, C and D are four pendulums suspended from the same elastic string XY. Lengths of pendulum A and D are equal, while the length of pendulum B is smaller and the pendulum C is longer. The pendulum A is set into vibration.
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The diagram below shows three different modes of vibration P, Q and R of the same string of a given length.
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| P | Q | R |
- Which vibration will produce a louder sound and why?
- Which vibration will produce sound of maximum shrillness (or pitch) and why?
- What is the ratio of wavelength of vibrations P and R?
Explain a tuning fork (vibrating) is held close to ear. One hears a faint sound. The same vibrating tuning fork is placed on table, such that its handle is in contact with table, one hears a loud sound.
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