# An antenna of length 25 m is mounted on top of a building of height 75 m.

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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 $$\ge {\lambda\over 4}$$

$$\lambda \le 4\times25$$

$$\lambda \le100m$$