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9th Class Science Sound Question Bank Sound Formative Objective Problems

  • question_answer
    A wave travels at a speed of 330 m/s. If the wavelength is 2.2 cm, what will be the frequency of the wave?

    A)  15,000 Hz           

    B)  14,500 Hz

    C)  15,500 Hz                           

    D)  14,000 Hz

    Correct Answer: A

    Solution :

                      \[v=330\text{ }m/s,\]\[\lambda =2.2cm=0.022m,\]\[f=?\] We know, \[V=f\lambda \] \[\Rightarrow \] \[f=\frac{V}{\lambda }=\frac{330}{0.022}Hz=15,000Hz\]              


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