A 50m long antenna is mounted on a 200 m tall building. The complex can become transmission tower for waves with wave length

$∼400 m$ $∼200 m$ $∼20 m$ $∼4 m$

$∼200 m$

The correct answer is option (2) : $∼200 m$ According to ques, length of building is = 200 m And length of antenna is = 50 m Wavelength of the wave that can be transmitted is as follows: $λ = 4l$ $⇒ λ = 4 × 50 = 200 m$