Science

Sound

Question:

Sketch larynx and explain its function in your own words.

Answer:

Larynx is a part of the throat. It is responsible for production of sound. A sketch of a human larynx is shown in the following figure.Larynx moves when we swallow something. Inside the larynx, there are two vocal cords. 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 vocal cords to vibrate. Since vibrating objects produce sound, sound is produced due to the vibration of vocal cords.
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Sound

Q 1.

Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house wouid you suggest your parents should buy? Explain your answer.

Q 2.

What is the difference between noise and music? Can music become noise sometimes?

Q 3.

The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?

Q 4.

Explain in what way noise pollution is harmful to humans.

Q 5.

List sources of noise pollution in your surroundings.

Q 6.

A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

Q 7.

Sketch larynx and explain its function in your own words.

Q 8.

Identify the part which vibrates to produce sound in the following instruments.(a) Dholak (b) Sitar (c) Flute