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प्रश्न
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उत्तर
A simple method for finding the velocity of sound is echo or open air method.
For example: A person stands at a known distance (d m) from a cliff and fires a pistol and simultaneously starts the stop watch. He stops the stop-watch as soon as he hears the echo. The distance traveled by sound during this time (t seconds) is twice the distance (2d m). The velocity (v) of sound is then calculated as under:
Velocity of sound= `"distance travelled"/" time taken" = (2"d")/"t"`
By repeating the experiment two or three times, the average velocity of sound can be calculated.
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संबंधित प्रश्न
Define amplitude term in relation to a wave.
State two factors on which the speed of a wave travelling in a medium depends.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
Name the principle on which a soundboard works.
Write the approximate value of the speed of sound in water.
How are bats able to fly in the dark?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
Waves produced on the surface of the water are formed to move with a velocity of 24 ms−1. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.
A sound wavelength of 0.332 m has a time period of 10−3 s. If the time period is decreased to 10−4 s, calculate the wavelength and frequency of the new wave.
