The area to be covered for T.V. telecast is doubled, then the height of transmitting antena (T.V. tower) will have to be:
Answer & explanation
Correct answer: option 1
The area of transmission surrounding the T.V. tower
A = $\pi d^2=\pi(2 \mathrm{hRe})$
A $\propto$ h
Hence the correct answer will be (A).