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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
Define frequency term in relation to a wave.
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
What are mechanical waves?
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
How are bats able to fly in the dark?
When a sound is made from a distance of 18 m, in front of a tall building, it is found to get repeated again. Which phenomenon is associated with this observation? Give a brief explanation of this phenomenon?
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.
