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### JEE Mains Previous Years Questions with Solutions

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### AIEEE 2002

MCQ (Single Correct Answer)
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
A
$20$
B
$80$
C
$40$
D
$120$

## Explanation

This will happen for fundamental mode of vibration as shown in the figure. ${S_1}$ and ${S_2}$ are rigid support

Here ${\lambda \over 2} = 40\,\,\,\,\,\,$ $\therefore$ $\lambda = 80\,cm$

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