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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Communication System

NTA Abhyas 2020 · Physics · Communication System

The height of a TV antenna is 200m . The population density is...

The height of a TV antenna is200m200m. The population density is 4000km−24000km^{- 2}. Find the population benefited

Options

  1. A3.2×1083.2 \times {10}^{8}
  2. B3.2×1073.2 × {10}^{7}
  3. C3.2×1063.2 \times {10}^{6}
  4. D3.2×1053.2 \times {10}^{5}

Correct answer

B. 3.2×1073.2 × {10}^{7}

Step-by-step solution

d=2hRd = \sqrt{2hR};

Population converted=\pid2×= \pid^{2} × population density

= \pi ( 2Rh ) × ρ

=227×2×6400×0.2×4000= \dfrac{22}{7} × 2 × 6400 × 0.2 × 4000

=3.2×107= 3.2 × {10}^{7}
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