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Why are cannot hear an echo in a small r...

Why are cannot hear an echo in a small room?

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MODERN PUBLICATION-SOUND-EXERCISE
  1. What is the least time interval required to hear a distinct echo?

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

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

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  4. Identify the longitudinal waves from the following.

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

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  6. What does a wave transfer?

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  7. Differentiate between crest and trough.

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

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

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  10. Draw graph for a wave representing wave disturbances and time for a so...

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  11. When does the ear drum of human ear vibrate?

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  12. List three points which an engineer should use while designing an audi...

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  13. A man fires a rifle in front of a cliff and hears the echo after 3 sec...

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  14. Waves of special frequencies are used for cleaning hard to reach place...

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  15. Waves of special frequencies are used for cleaning hard to reach place...

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  16. Waves of special frequencies are used for cleaning hard to reach place...

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  17. In SONAR, we use

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  18. When we change feeble sound to loud we increase its

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  19. A pulse is generated at one end of the slinky of length 10 m. The puls...

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  20. A longitudinal pulse is produced in a slinky. The frequency of the pul...

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