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Chapter 13 Sound Solutions

Question - 11 : -
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 would you suggest your parents should buy? Explain your answer.

Answer - 11 : -

I will suggest my parents to buy the house which is three lanes away from the roadside. This is because the house on the roadside will receive the unwanted sounds of vehicles whereas the house which is three lanes away from the roadsides will be free from noise pollution.

Question - 12 : -
Sketch larynx and explain its function in your own words.

Answer - 12 : -

In humans, the sound is produced by the voice box or the larynx. It is situated in the throat. Below it is the wind pipe. The two vocal cords are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for the passage of air when the lungs force air through the slit, the vocal cords vibrate and the vibration results in sound.

Question - 13 : -
Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain why?

Answer - 13 : -

Light travels at the speed of 3 x 108 m/s while sound travels at a speed of 332 m/s i.e., light travels much faster than sound. That is why, lightning is seen earlier and thunder is heard later.

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