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A 25 m long, antenna is mounted on an antenna tower. The height of the antenna tower is 75 m. The wavelength (in meter) of the signal transmitted by the antenna would be :

(1) 300  (2) 400 (3) 100 (4) 200
in Physics
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height of antenna=$$\lambda\over 4$$
25=$$\lambda\over 4$$
$$\lambda=100$$