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The intensity of sound wave gets reduced...

The intensity of sound wave gets reduced by 20% on passing through a slab. The reduction in intensity on passing through two consecutive slabs is

A

0.4

B

0.36

C

0.3

D

0.5

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MODERN PUBLICATION-SOUND-EXERCISE
  1. The frequency of a source of sound is 50 Hz. How many times does it vi...

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  2. A key of a mechanical paino struck gently and then struck again but mu...

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  3. The intensity of sound wave gets reduced by 20% on passing through a s...

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  4. Sound travels the fastest in

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  5. A person clapped his hands near a cliff and heard the echo after 5 s. ...

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  6. The frequency of seconds pedulum is

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  7. A source emits sound of frequency 600 Hz inside water. The frequency h...

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  8. Distance between a consecutive crest and trough is 5 cm. The wave leng...

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  9. In which part of the ear are sound waves amplified?

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  10. Which of the following help in the communication between two astronatu...

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  11. A marine survey ship sends a sound wave straight to the sea bed. It de...

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  12. What is the least time interval required to hear a distinct echo?

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  13. Which of the following statements about sound waves is correct?

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  14. The regions of compressions and rarefractions of sound wave are establ...

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  15. Identify the longitudinal waves from the following.

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  16. A wave source produces 10 oscillations in 100 ms . Find the time perio...

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  17. What does a wave transfer?

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  18. Differentiate between crest and trough.

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  19. Why are cannot hear an echo in a small room?

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  20. Mention the types of mechanical waves. Identify the type which can be ...

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