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प्रश्न
How is sound produced in a human larynx and a loudspeaker?
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उत्तर
Production of sound in humans
The larynx (voice box) is responsible for producing sounds in humans. It consists of two vocal cords. These cords are arranged in such a manner that there is a small gap between them. This small gap allows air to pass through. When we speak, air is forced into this small gap by the lungs. This prompts our vocal cords to vibrate and hence, produce sounds.
Production of sound in loudspeaker
A loudspeaker consists of following parts:
- An electric coil wound on a permanent magnet.
- A conical shaped screen of the speaker connected to the coil.
Now, when variable current flows through the coil, magnetic field is produced around it due to electromagnetism, and it behaves like an electromagnet. Because of this, the coil is repelled and attracted by the permanent magnet alternately. The screen attached to the coil moves back and forth due to the attraction and repulsion of the coil and hence, produces sound.
संबंधित प्रश्न
Fill in the blank.
Sound is produced when a body ______.
Describe an experiment to show that each source of sound is a vibrating body.
What minimum distance is required between the source of sound and the reflecting surface to hear an echo ? Give reason.
Which of the following cannot transmit sound? Water, Vacuum, Aluminium, Oxygen gas
If a ringing bicycle bell is held tightly by hand, it stops producing sound. Why?
Give reason for the following :
In most of the cases, we cannot see the vibrations of a sound producing object with our eyes.
How does sound from a sound producing body travel through air to reach our ears? Illustrate your answer with the help of a labelled diagram.
Fill in the blank with suitable word.
When the frequency of the sound is increased, the wavelength ____________.
Describe an experiment to show that sound cannot travel through vaccum.
______ is produced when an object is set to vibrate.
