$\begin {array} {1 1} (a)\;\lambda_a > \lambda_f & \quad (b)\;\lambda_a = \lambda_f \\ (c)\;\lambda_a < \lambda_f & \quad (d)\;\text{ can't be determined} \end {array}$

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Bending of wave around the corner occurs, if the dimension of the board is comparable to the wavelength of the wave.

From the given information we know that $ \lambda_a$ since no bending of FM waves take place two possibilities may arise whether $ \lambda_f>>1m \: or\: \lambda_f<<1m$.

$ \lambda_f>>1m \: or\: \lambda_f<<1m$.

So, information is insufficient to determine whether $ \lambda_a>\lambda_f$ is comparable to $1m$. But, or $\lambda_a<\lambda_f.$

Ans : (d)

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