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
Correct option: (b) 80
From the given,
λ/2 = 40 cm
λ = 40 × 2 = 80 cm

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