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Question
Define the term Frequency (as applied to sound waves)
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Solution
The number of vibrations per second taken by a wave is called its frequency.
RELATED QUESTIONS
Define frequency term in relation to a wave.
Define wave velocity term in relation to a wave.
Name two sound absorbing materials (or objects) which can make our big room less echoey.
Write the approximate value of the speed of sound in air.
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
(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 |
