CBSE Class 9 Physics Help

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  1. Vinila Choudary

    Describe an activity to study the reflection of sound.

    Vinila Choudary, Mar 23, 2012
    Replies:
    1
    Views:
    2,321
    ford4582
    Aug 18, 2020
  2. hul043956

    Cá cược thể thao FB88 trực tuyến tại FB88 - An toàn, bảo mật, uy tín

    hul043956, Aug 16, 2020
    Replies:
    0
    Views:
    19
    hul043956
    Aug 16, 2020
  3. ford4582

    hướng dẫn chi tiết cách tăng doanh thu khi trở thành đại lý A+Bet

    ford4582, Aug 8, 2020
    Replies:
    0
    Views:
    26
    ford4582
    Aug 8, 2020
  4. ford4582

    kèo nhà cái - tỷ lệ kèo cá cược bóng đá A+Bet cập nhật mới nhất

    ford4582, Aug 4, 2020
    Replies:
    0
    Views:
    24
    ford4582
    Aug 4, 2020
  5. Vinila Choudary

    If 20 waves are produced per second, what is the frequency in hertz?

    Vinila Choudary, Jan 30, 2012
    Replies:
    1
    Views:
    2,165
    usama
    Nov 25, 2018
  6. Vinila Choudary

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

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    2,544
    Vinila Choudary
    Mar 23, 2012
  7. Vinila Choudary

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

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    797
    Vinila Choudary
    Mar 23, 2012
  8. 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
    Views:
    680
    Vinila Choudary
    Mar 23, 2012
  9. 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
    Views:
    1,103
    Vinila Choudary
    Mar 23, 2012
  10. Vinila Choudary

    calculate the distance of hill from the boy.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    683
    Vinila Choudary
    Mar 23, 2012
  11. Vinila Choudary

    calculate the wavelength and frequency of new wave.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    873
    Vinila Choudary
    Mar 23, 2012
  12. 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
    Views:
    692
    Vinila Choudary
    Mar 23, 2012
  13. Vinila Choudary

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

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    719
    Vinila Choudary
    Mar 23, 2012
  14. Vinila Choudary

    wavelength when frequency is 256 Hz.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    857
    Vinila Choudary
    Mar 23, 2012
  15. Vinila Choudary

    State the laws of reflection of sound.

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    725
    Vinila Choudary
    Mar 23, 2012
  16. Vinila Choudary

    What is meant by reflection of sound?

    Vinila Choudary, Mar 23, 2012
    Replies:
    0
    Views:
    682
    Vinila Choudary
    Mar 23, 2012
  17. Vinila Choudary

    Why do we hear the sound produced by the humming bees

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
    Views:
    932
    Vinila Choudary
    Feb 29, 2012
  18. 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
    Views:
    2,015
    Vinila Choudary
    Feb 29, 2012
  19. Vinila Choudary

    Write any three applications of ultrasound.

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
    Views:
    3,071
    Vinila Choudary
    Feb 29, 2012
  20. Vinila Choudary

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

    Vinila Choudary, Feb 29, 2012
    Replies:
    0
    Views:
    5,420
    Vinila Choudary
    Feb 29, 2012
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