A stretched string is fixed at both its ends. Three possible wavele...

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A stretched string is fixed at both its ends. Three possible wavelengths of stationary wave patterns
\( \mathrm{P} \) that can be set up in the string are \( 90 \mathrm{~cm}, 60 \mathrm{~cm} \) and

W \( 45 \mathrm{~cm} \). The length of the string may be
(1) \( 80 \mathrm{~cm} \)
(2) \( 120 \mathrm{~cm} \)
(3) \( 90 \mathrm{~cm} \)
(4) \( 45 \mathrm{~cm} \)
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