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Answer the following question giving exp...

Answer the following question giving explanations wherever necessary.
Lightning 'and thunder take place in sky and at tlie same distance from us. Explain why-lightning is seen earlier and thunder is heard later.

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The speed of sound is less than the speed of light. Hence, light reaches us before the sound during a lightning, which is accompanied by thundering.
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NCERT-SOUND -QUESTIONS
  1. In the statement, tick 'T' against those which are true, and 'F' agai...

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  2. In the statement, tick 'T' against those which are true, and 'F' agai...

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  3. In the statement, tick 'T' against those which are true, and 'F' agai...

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  4. In the statement, tick 'T' against those which are true, and 'F' agai...

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  5. Fill in the blanks with suitable word Time taken by an object to com...

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  6. Fill in the blanks with suitable word Loudness is determined by the...

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  7. Fill in the blanks with suitable word The unit of frequency is

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  8. Fill in the blanks with suitable word Unwanted sound is called

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  9. Fill in the blanks with suitable word Shrillness of a sound is deter...

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

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  11. The sound from a mosquito is produced when it vibrates its wings at an...

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  12. Identify the part which vibrates to produce sound in the instruments. ...

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  13. Identify the part which vibrates to produce sound in the instruments. ...

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  14. Identify the part which vibrates to produce sound in the instruments. ...

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  15. What is the difference between noise and music? Can music become noise...

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  16. List sources of noise pollution in your surroundings.

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  17. Explain in what way noise pollution is harmful to humans.

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  18. Your parents are going to buy a house. They have been offered one on t...

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  19. Sketch larynx and explain its function in your own words.

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  20. Answer the following question giving explanations wherever necessary. ...

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