First slide

Standing waves

Question

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

Moderate

A

20
B

80
C

40
D

120

Solution

In fundamental mode of vibration wavelength is maximuum $\Rightarrow l = \frac{λ}{2} = 40 cm \Rightarrow λ = 80 cm$

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