Question

A TV transmitting antena is 80 m tall .if the receiving antena is on ground.The service are is

• A. $12\pi sqkm$
• B. $144\pi sqkm$
• C. $1024\pi sqkm$
• D. $32\pi sqkm$

Answer 1

The correct option is C $1024\pi sqkm$

given$,$

Height of antena $h=80m$

$R=6.4\times {10}^{6}m$

$d=2Rh$

$A=\pi d$

$=\pi 2Rh$

$=\pi \times 2\times 6.4\times {10}^6\times 80$

$=1024\pi \times {10}^6{m}^2$

$=1024\pi K{m}^2$

Hence,

option $\left(c\right)$ is correct answer.