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प्रश्न
Define wavelength term in relation to a wave.
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उत्तर
The distance travelled by the wave in one time period of vibration of a particle of medium is called its wavelength. It's S.I. unit is metre (m).
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संबंधित प्रश्न
Define frequency term in relation to a wave.
State the use of echo by a bat, dolphin and fisherman.
Name two sound absorbing materials (or objects) which can make our big room less echoey.
Explain how the principle of echo is used by the bat during its flight at night.
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
State two factors on which the natural frequency of a body depends.
(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 meant by an echo? Explain.
Match the following:
| 1. | Stethoscope | a. | Repeated reflections |
| 2. | Echogram | b. | Multiple reflections |
| 3. | SONAR | c. | Ultrasonic waves |
| 4. | Reverberation | d. | Speed of underwater objects |
