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8th Class Science Sound Question Bank Sound

  • question_answer
    A man fires a gun 150 m from a cliff. A second man who is standing 300 m further away from the cliff hears the gun 1 second after he sees the flash. The second man will hear the echo from the cliff

    A)  1 second after seeing the flash

    B)  2 seconds after hearing the gun

    C)  2 seconds after seeing the flash

    D)  4 seconds after hearing the gun.

    Correct Answer: C

    Solution :

    Echo will be heard when the sound of the gun gets reflected from the cliff, Thus the total distance travelled by the sound of gun,\[S={{x}_{1}}+{{x}_{2}}+{{x}_{3}}\] = 150+150+300 =600 m \[v\text{ }=\text{ }300\text{ }m\text{ }{{s}^{-1}}\] \[\therefore t=\frac{S}{v}=\frac{600}{300}=2s\]


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