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9th Class Science Sound Question Bank Sound IIT JEE Subjective Problems

  • question_answer
    A vibrating body is producing 30 waves in 6 seconds. The distance between a crest and next trough is 20 cm. Calculate the velocity of the waves.

    Answer:

    Frequency, \[n=\frac{30}{6}=5Hz\]and \[\frac{\lambda }{2}=20\,cm\] \[\Rightarrow \]\[\lambda =40\,cm=0.4\,m\]


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