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An antenna of length 25 m is mounted on top of a building of height 75 m. Then the maximum wavelength of the transmission signal is close to :

(1) 100 m          (2) 200 m         (3) 300 m         (4) 400 m
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The correct option is 1)100 m 

Length of antenna \(\ge {\lambda\over 4}\) 

\(\lambda \le 4\times25\) 

\(\lambda \le100m\)

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