A stretched string of length \( l \), fixed at both ends can sustai...

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A stretched string of length \( l \), fixed at both ends can sustain stationary waves of wavelength \( \lambda \), given by
\( \mathrm{P} \)
[UPSEAT 2000; Pb. PET 2004; CPMT 2005]
W
(a) \( \lambda=\frac{n^{2}}{21} \)
(b) \( \lambda=\frac{l^{2}}{2 n} \)
(c) \( \lambda=\frac{2 l}{n} \)
(d) \( \lambda=2 l n \)
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