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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
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
The following diagram shows three ways in which the string of an instrument can vibrate.
(a) which of the diagram shows the principal note?
(b) which has the frequency four times that of the first?
(c) what is the ratio of the frequency of the vibration in (i) and (ii)?
Name two sound absorbing materials (or objects) which can make our big room less echoey.
What is a megaphone ? Name the principle on which a megaphone works.
A type of electromagnetic wave has a wavelength of 50 Å. Name the wave and state one use of this type of wave.
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
What is meant by an echo? Explain.
The direction of the incident sound, the direction of reflected sound, and the normal are in different Planes.
