AP EAMCET · PHYSICS · Communication System
The maximum distance between the transmitting and receiving antennas for satisfactory communication in line of sight mode is 57.6 km . If the height of the receiving antenna is 80 m , the height of the transmitting antenna is (Radius of earth \(=6.4 \times 10^6 \mathrm{~m}\) )
- A 28.8 m
- B 51.2 m
- C 25.6 m
- D 14.4 m
Answer & Solution
Correct Answer
(B) 51.2 m
Step-by-step Solution
Detailed explanation
\begin{aligned} & \text { Range }=57.6 \mathrm{~km}, \mathrm{~h}_{\mathrm{r}}=80 \mathrm{~m}, \mathrm{R}=6.4 \times 10^6 \mathrm{~m} \\ & \therefore \text { Range }=\sqrt{2 \mathrm{Rh}_{\mathrm{r}}}+\sqrt{2 \mathrm{Rh}_{\mathrm{t}}} \\ & \Rightarrow 57.6 \times 10^3=\sqrt{2…
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