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9th Class Science Sound Question Bank Sound HOTS Objective Problems

  • question_answer
    Martha is studying the position versus time graphs of two different waves, as shown in the given figure. Speed of a wave is defined as the product of its frequency and wavelength.
    The two waves have the same

    A)  frequency and speed

    B)  speed and amplitude

    C)  amplitude and wavelength

    D)  wavelength and frequency

    Correct Answer: B

    Solution :

      In order to answer this question correctly, the student needs to analyze the characteristics of wave motion. In both graphs, the maximum height of the waves is 1 cm on both sides of the mean position. Thus, the amplitudes of the two waves are same. The speed of a wave is defined as the product of its wavelength and frequency. Frequency of the wave represented in graph I is 1 Hz, while the frequency of the wave represented in graph II is 2 Hz. The wavelength of the wave represented in graph II is double the wavelength of the wave represented in graph I. Therefore, the speeds of both waves are equal. Hence, the two waves have the same speed and amplitude. The correct answer is B.


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