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9th Class Science Sound Question Bank Sound Conceptive Objective Problems

  • question_answer
    The time period of an electromagnetic waves is 10-15 seconds. What is the frequency of wave in hertz?

    A)  \[\text{1}{{0}^{\text{15}}}\]     

    B)  \[\text{1}{{0}^{\text{5}}}\]   

    C)  \[\text{1}{{0}^{2}}\]                     

    D)  \[\text{1}{{0}^{7}}\]

    Correct Answer: A

    Solution :

      Given \[(T)={{10}^{15}}s\] \[f=?\] We know, \[F=\frac{1}{T}=\frac{1}{{{10}^{-15}}s}={{10}^{15}}Hz\]           


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