You are driving in your car listening to music on the radio. Your car is equipped with radio that can recieved radio singals of frequency $(f_1 \approx\, 3\, MHz),$ other of frequency $(f_2 \approx\, 30\, MHz),$ and third of frequency $(f_3 =\, 3\, GHz),$. You enter a tunnel with a circular opening of diameter $10\ m.$ Which kind of radio signal will you be able to receive the longest as you continue to travel in the tunnel ?
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In the tunnel only diffracted signal will reach and for diffraction size of obstacle must be of order of wavelength
$\mathrm{v}=\mathrm{n} \lambda.$
$\lambda_{1}=100 \mathrm{\,m}, \lambda_{2}=10 \mathrm{\,m} ; \lambda_{3}=.01 \mathrm{\,m}$ therefore $\mathrm{f}_{2}$ will be the frequency.
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