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9th Class Science Sound Question Bank Sound HOTS Objective Problems

  • question_answer
    Antonio drops a big stone from a bridge into a river. A wave of amplitude 20 cm and wavelength 25 cm is created in the river water. Which of the following figures represents the wave created in the river water?

    A)                       

    B)  

    C)  

    D)  

    Correct Answer: B

    Solution :

      The distance between two consecutive crests or troughs is known as the wavelength of a wave. The figures in alternatives B and C respectively show the distance between two consecutive crests and troughs as 25 cm. The maximum height of a crest or a trough is known as the amplitude of a wave. The figures in alternatives B and D respectively show the maximum height of a crest and a trough from the mean position as 20 cm. Therefore, only the figure in alternative B represents the wave of amplitude 20 cm and wavelength 25 cm, as created in the river water. The correct answer is B.


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