Which of the following statement is correct?

 1 The energy of any small part of a string remains constant in a travelling wave. 2 The energy of any small part of a string remains constant in a standing wave. 3 The energies of all the small parts of equal length are equal in a travelling wave. 4 The energies of all the small parts of equal length are equal in a standing wave.

Subtopic: Â Energy of Waves |
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Two sound waves move in the same direction in the same medium. The pressure amplitudes of the waves are equal but the wavelength of the first wave is double the second. Let the average power transmitted across cross-section by the first wave be $$P_1$$ and that by the second wave be $$P_2.$$ Then:

 1 $$P_1=P_2~~~~~$$ 2 $$P_1=4P_2~~~~~$$ 3 $$P_2=2P_1$$ 4 $$P_2=4P_1$$
Subtopic: Â Energy of Waves |
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When two waves with same frequency and constant phase difference interfere,

 1 there is a gain of energy. 2 there is a loss of energy. 3 the energy is redistributed and the distribution changes with time. 4 the energy is redistributed and the distribution remains constant in time.

Subtopic: Â Energy of Waves |
Â 70%
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