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प्रश्न
What do you mean by the frequency of sound?
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उत्तर
The frequency of sound is defined as the number of vibrations produced by the sound-producing object per second.
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संबंधित प्रश्न
What are wavelength, frequency, time period and amplitude of a sound wave?
Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.
Write true or false for a given statement.
A sound is a form of energy.
A musician recognizes the musical instrument by hearing the sound produced by it, even without seeing the instrument. Which characteristic of sound makes this possible ?
State the general name of the waves in which the particles of the medium vibrate :
(i) in the same direction as wave.
(ii) at right angles to the direction of wave.
A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
Match the following.
| Ultrasonics | Frequency below 20Hz |
| Speed of sound in air | Needs material medium |
| Infrasonics | 330ms-1 |
| Sound propagation | Frequency more than 20000 Hz |
Waves created by Earth Quake are Infrasonic.
Name three animals, which can hear ultrasonic vibrations.
