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प्रश्न
State the use of echo by a bat, dolphin and fisherman.
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उत्तर
Bats, dolphin and fisherman detect their enemies or obstacles or position of fish by emitting/sending the ultrasonic waves and hearing/detecting the echo.
संबंधित प्रश्न
State two differences between the light and sound waves.
What is a megaphone ? Name the principle on which a megaphone works.
What is a stethoscope ? Name the principle on which a stethoscope works.
What are infrasonic waves?
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.
What is meant by echo depth sounding?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
Write short notes on reflection of sound waves from plane and curved surfaces.
