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प्रश्न
उत्तर
The sound heard after reflection from a rigid obstacle (such as cliff, a hillside, a wall of a building, edge of a forest etc.), is called an echo.
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संबंधित प्रश्न
How is the frequency of a stretched string related it’s tension?
Define amplitude term in relation to a wave.
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
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 the shape of a soundboard kept behind the speaker on the stage of a big hall ?
Explain how the principle of echo is used by
The bat during its flight at
What are mechanical waves?
Explain why, the ceilings of concert halls are curved.
Write short notes on reflection of sound waves from plane and curved surfaces.
