A sound wave with an amplitude of 6 cm starts towards right from origin and gets reflected at a rigid wall after a second. Considering no energy loss at the wall, the reflected wave will have an amplitude of
A
-3 cm
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B
+ 3 cm
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C
-6 cm
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D
0 cm
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Solution
The correct option is C -6 cm Upon reflection , since energy is not lost, amplitude will not change. Since it is happening in a rigid wall phase reversal takes place and hence the correct answer is -6 cm