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प्रश्न
Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves, and thermal radiation, the energy is propagated by mechanical waves.
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उत्तर
The energy, in sound and ultrasonic waves, is propagated by mechanical waves.
संबंधित प्रश्न
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 ms1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range
Define frequency term in relation to a wave.
State two differences between the light and sound waves.
State the use of echo by a bat, dolphin and fisherman.
What is the shape of a soundboard kept behind the speaker on the stage of a big hall ?
What is a stethoscope ? Name the principle on which a stethoscope works.
Explain how the principle of echo is used by
The bat during its flight at
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
What is mean by the reflection of sound?
A sound wave whose frequency is 5000 Hz travels in air and then hits the water surface. The ratio of its wavelengths in water and air is ______.
