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प्रश्न
What is an echo
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उत्तर
The sound heard after reflection from a distant obstacle after the original sound has ceased is called an echo.
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संबंधित प्रश्न
The lower the frequency of vibration, the higher is the pitch.
State the safe limit of sound level in terms of decibel for human hearing.
Match the following
| column A | column B |
| (A) Amplitude | (1) frequency |
| (B) Frequency | (2) amplitude |
| (C) Loudness | (3)maximum displacement on either side |
| (D) Pitch | (4) presence of other frequencies |
| (E) Waveform | (5) 1/ time period |
The unit of loudness is _______.
If the amplitude of a wave is doubled, what will be the effect on its loudness?
Figure shows four waves A, B, C, and D
Name the wave which shows
(a) a note from a musical instrument,
(b) a soft note
(c) a shrill note.
Two waves of the same pitch have amplitudes in the ratio 1 : 3 What will be the ratio of their
- loudness,
- pitch?
Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quality? Give a reason for your answer.
It is observed that during march-past we hear a base drum distinctly from a distance compared to the side drums.
(i) Name the characteristics of sound associated with the above obervation.
(ii) Give a reason for the above observation.
