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प्रश्न
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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उत्तर
When the tuning fork is held close to ear, then small amount of air is disturbed and hence sound is faint. When the handle of the vibrating tuning fork is held aganist table, it makes the table top to vibrate, with forced vibrations. As the table top has a larger surface area, therefore large volume of air is set into vibrations, thereby producing a loud sound.
संबंधित प्रश्न
Distinguish between the free (or natural) and forced vibrations.
Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
A tuning fork of frequency 256 Hz will resonate with another tuning fork of frequency:
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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 |
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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?
A bucket kept under a running tap is getting filled with water. A person sitting at a distance is able to get an idea when the bucket is about to be filled.
(i) What change takes place in the sound to give this idea?
(ii) What causes the change in the sound?
Give two examples of forced vibrations.
What do you mean by resonance? When does resonance occur?
Explain why are soldiers asked to walk out of step while crossing bridges?
Explain free and forced vibrations. Give an experimental arrangement to illustrate the phenomenon of resonance.
