Length of a string tied to two rigid supports is $40 cm$. Maximum length (wavelength in $cm$) of a stationary wave produced on it is ... $cm$
AIEEE 2002, Easy
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(b) In fundamental mode of vibration wavelength is maximum
$\Rightarrow$$l = \frac{\lambda }{2} = 40\,cm\, \Rightarrow \lambda = 80\,cm$
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