Advertisements
Advertisements
प्रश्न
Give a scientific reason.
We can hear the movement of a mosquito’s wings but we cannot hear the movement of our hands.
Advertisements
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
State the safe limit of sound level in terms of decibel for human hearing.
When sound propagates in air, it does not carry energy with it.
The safe limit of loudness of audible sound is
The unit of loudness is _______.
Draw a diagram to show the wave pattern of high pitch note and a low pitch note, but of the same loudness.
A man playing a flute is able to produce notes of different frequencies. If he closes the holes near his mouth, will the pitch of the note produced, increase or decrease? Give a reason.
Name musical instrument, one in each case, which produces its notes by using the following. In each case state the method used to produce notes of different pitches and loudness.
(a) A vibrating string.
(b) A vibrating column air.
(c) Vibration of any other body.
The frequency of the stretched string of a fixed length is f when it is plucked in the middle. Where should it be plucked so that string vibrates with frequency (i) 2f, (ii) 3f?
Draw diagrams to show these vibrations and name them.
What is acoustics?
