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प्रश्न
What is the general name of the waves consisting of :
(a) compressions and rarefactions?
(b) crests and troughs?
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उत्तर
(a) Longitudinal waves are the general name of compression and rarefaction.
(b) Transverse waves are the general name of crests and troughs.
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संबंधित प्रश्न
Describe an experiment to estimate the speed of sound in air.
What minimum distance is required between the source of sound and the reflecting surface to hear an echo ? Give reason.
What is the SI unit of frequency?
Name the device which is used to produce sound in laboratory experiments?
A tuning fork has a number 256 marked on it. What does this number signify?
What will be the change in the wavelength of a sound wave in air if its frequency is doubled?
Give reason for the following :
In most of the cases, we cannot see the vibrations of a sound producing object with our eyes.
A device called oscillator is used to send waves along a stretched string. The string is 20 cm long, and four complete waves fit along its length when the oscillator vibrates 30 times per second. For the waves on the strings.
(a) what is their wavelength?
(b) what is their frequency
(c) what is their speed?
Match the following:
| Human larynx | Vibrations of metal arms |
| Loudspeaker | Vibrations in air column |
| Jal-Tarang | Vibrations in vocal cords |
| Tuning fork | Vibrations in strings |
| Sitar | Vibrations of screen |
Write the answer in your own words.
What is meant by vibration?
