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प्रश्न
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.
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उत्तर
(i) We have,
Wave velocity = Frequency × Wavelength
24 ms−1 = n × (20 × 10−2 m)
or n = `24/(24xx10^-2)` = 120 per second.
(ii) Time period = `1/"Frequency"=(1/120)"sec."` = 0.00833 sec.
The approximate frequency range of sound waves is about 15 to 200,000 Hz.
संबंधित प्रश्न
State two factors on which the speed of a wave travelling in a medium depends.
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
Write the approximate value of the speed of sound in iron.
What do you understand by the ‘Echolocation system of Dolphins’?
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.
What is meant by an echo? Explain.
