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प्रश्न
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
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उत्तर
Here we refer to a mechanical wave, its two properties are:
(i) These waves transmit only energy and momentum through the limited motion of the particles of the medium.
(ii) While transmitting energy, the medium remains unshifted, i.e., only energy is transmitted while particles of the matter of the medium do not travel with the same.
संबंधित प्रश्न
How is the frequency of a stretched string related to its length?
State two factors on which the speed of a wave travelling in a medium depends.
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)?
What is a stethoscope ? Name the principle on which a stethoscope works.
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
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Explain why, the ceilings of concert halls are curved.
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 |
