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प्रश्न
What type of waves are generated by SONAR device fixed to a fishing ship ?
विकल्प
water waves
radio waves
sound waves
infrared waves
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उत्तर
SONAR uses ultrasonic sound waves.
(c) Sound waves.
संबंधित प्रश्न
Give two practical applications of reflection of sound waves.
A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
Define the 'frequency' and 'time-period' of a wave. What is the relation between the two?
Name the characteristic of sound which depends on (a) amplitude (b) frequency, and (c) waveform.
Explain the term 'pitch' of a sound. On what factor does the 'pitch' of a sound depend ?
Draw labelled diagrams to represent sound of (a) low pitch, and (b) high pitch, of the same loudness.
Explain why, if we strike a table lightly, we hear a soft sound but if we hit the table hard, a loud sound is heard.
Explain how, flaws (or defects) in a metal block can be detected by using ultrasound.
A sonar station picks up a return signal after 3 seconds. How far away is the object ? (Speed of sound in water = 1440 m/s).
Expand the abbreviation of the term SONAR.
