CBSE Class 9 Physics Help

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  1. Vinila Choudary

    when the train is far off but its sound cannot be heard through air. Why

    Vinila Choudary, Mar 23, 2012
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    2,287
    Vinila Choudary
    Mar 23, 2012
  2. Vinila Choudary

    A powerful sound signal sent from a ship is received again after 2.4 seconds.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
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    615
    Vinila Choudary
    Mar 23, 2012
  3. Vinila Choudary

    The boy hears the echo of his shout after 4.8 seconds. Find the speed of the sound.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
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    558
    Vinila Choudary
    Mar 23, 2012
  4. Vinila Choudary

    A sound wave has a frequency 2 kHz and wavelength 40 cm. How long will it take to travel 1.6 km?

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
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    844
    Vinila Choudary
    Mar 23, 2012
  5. Vinila Choudary

    calculate the distance of hill from the boy.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
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    546
    Vinila Choudary
    Mar 23, 2012
  6. Vinila Choudary

    calculate the wavelength and frequency of new wave.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
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    736
    Vinila Choudary
    Mar 23, 2012
  7. Vinila Choudary

    A longitudinal wave of wavelength 1 cm travels in air with a speed of 330 rn/s.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
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    529
    Vinila Choudary
    Mar 23, 2012
  8. Vinila Choudary

    The wavelength of waves produced on the surface of water is 20 cm.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    571
    Vinila Choudary
    Mar 23, 2012
  9. Vinila Choudary

    wavelength when frequency is 256 Hz.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    720
    Vinila Choudary
    Mar 23, 2012
  10. Vinila Choudary

    State the laws of reflection of sound.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    568
    Vinila Choudary
    Mar 23, 2012
  11. Vinila Choudary

    Describe an activity to study the reflection of sound.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    1,896
    Vinila Choudary
    Mar 23, 2012
  12. Vinila Choudary

    What is meant by reflection of sound?

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    540
    Vinila Choudary
    Mar 23, 2012
  13. Vinila Choudary

    Why do we hear the sound produced by the humming bees

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
    Views:
    738
    Vinila Choudary
    Feb 29, 2012
  14. Vinila Choudary

    What is a sound board? Explain the working of a soundboard with the help of a labelled diagram.

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
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    1,367
    Vinila Choudary
    Feb 29, 2012
  15. Vinila Choudary

    Write any three applications of ultrasound.

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
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    1,193
    Vinila Choudary
    Feb 29, 2012
  16. Vinila Choudary

    What do you mean by an echo? State two conditions for hearing a distinct echo.

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
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    4,449
    Vinila Choudary
    Feb 29, 2012
  17. Vinila Choudary

    Explain the terms crests and troughs of a wave.

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
    Views:
    754
    Vinila Choudary
    Feb 29, 2012
  18. Vinila Choudary

    What is a stethoscope? Name the principle on which a stethoscope works.

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
    Views:
    5,371
    Vinila Choudary
    Feb 29, 2012
  19. Vinila Choudary

    What are transverse waves? Give two examples.

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
    Views:
    636
    Vinila Choudary
    Feb 29, 2012
  20. Vinila Choudary

    What are longitudinal waves? Give two examples.

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
    Views:
    809
    Vinila Choudary
    Feb 29, 2012
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