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Mark out the correct options.
(a) The energy of any small part of a string remains
\( \mathrm{P} \) constant in a travelling wave.
(b) The energy of any small part of a string remains
W constant in a standing wave.
(c) The energies of all the small parts of equal length are equal in a travelling wave.
(d) The energies of all the small parts of equal length are equal in a standing wave.
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