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प्रश्न
Give a scientific reason.
We can hear the movement of a mosquito’s wings but we cannot hear the movement of our hands.
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उत्तर
The frequency of the sound produced by the movement of a mosquito’s wings lies within the human audible range (20 Hz to 20,000 Hz), whereas the sound produced by the movement of our hands has a frequency below 20 Hz, which is inaudible to humans. Therefore, we can hear the movement of a mosquito's wings but not that of our hands.
संबंधित प्रश्न
A person is standing at the seashore. An observer on the ship which is anchored in between a vertical cliff and the person on the shore fires a gun. The person on the shore hears two sounds, 2 seconds and 3 seconds after seeing the smoke of the fired gun. If the speed of sound in the air is 320 ms-1 then calculate:
1) the distance between the observer on the ship and the person on the shore.
2) the distance between the cliff and the observer on the ship.
When sound propagates in air, it does not carry energy with it.
The distance from one compression to nearest rarefaction is called wavelength.
The frequency is measured in second.
If the amplitude of a wave is doubled, what will be the effect on its loudness?
Name three characteristics of a musical sound.
How does the two sounds of same loudness and same pitch produced by different instruments differ? Draw diagrams to illustrate your answer.
Name the factors which determine the pitch of a note.
How do you account for the fact that two strings can be used to give notes of the same pitch and loudness but of different quality?
What is meant by the ‘loudness’ of a sound? How is it related to the intensity?
