AP EAMCET · PHYSICS · Communication System
A TV transmitting antenna is \(128 \mathrm{~m}\), tall. If the receiving antenna is at the ground level, the maximum distance between, them for satisfactory communication in line of sight mode is (radius of the earth \(6.4 \times 10^6 \mathrm{~m}\) )
- A \(64 \times \sqrt{10} \mathrm{~km}\)
- B \(\frac{128}{\sqrt{10}} \mathrm{~km}\)
- C \(128 \times \sqrt{10} \mathrm{~km}\)
- D \(\frac{64}{\sqrt{10}} \mathrm{~km}\)
Answer & Solution
Correct Answer
(B) \(\frac{128}{\sqrt{10}} \mathrm{~km}\)
Step-by-step Solution
Detailed explanation
Height of transmitting antenna \(d \approx \sqrt{2 R_e h_T}\) Given \(\begin{aligned} R_e & =6.4 \times 10^6 \mathrm{~m} \\ h_T & =128 \mathrm{~m} \\ d & =? \end{aligned}\) The maximum distance…
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