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question_answer1) Match the following: Column I Column II (1) The minimum distance between man & wall to listen the echo is (A) echo (2) SONAR works based on the principle (B) 0.1 sec (3) Persistence of hearing of human ear (C) 17 m (4) Reflection of sound (D) Reverberation
question_answer2) In the given figure, a displacement - distance graph for a wave is shown. The wave velocity is 320 m/s. (a) The wavelength of the wave is 0.4 m (b) The frequency of the wave is 800 Hz (c) The amplitude of the wave is 2 cm (d) The frequency of the wave is 400 Hz
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