Correct Answer: Option B

Explanation

F = \(\frac {1}{2L}\) \(\sqrt\frac{T}{m}\)

T₂ = 4T₁ ; L₂ = 2L₁

\(\frac{2F_1L_1}{2F_2L_2}\) = \(\sqrt\frac{T_1}{T_2}\)

\(\frac{400\times L_1}{F \times L_1}\) = \(\sqrt\frac{T_1}{4T_1}\)

F = 400Hz

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