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

NTA Abhyas 2020 · Physics · Communication System

A T.V. tower has a height of 100m . The population covered by T.V....

A T.V. tower has a height of 100m100m. The population covered by T.V. broadcast is, if the average population density around the tower is 1000peoplekm−21000people{km}^{- 2}.

Options

  1. A39.5×105units39.5 \times {10}^{5} \text{units}
  2. B19.5×105units19.5 \times {10}^{5} \text{units}
  3. C29.5×105units29.5 \times {10}^{5} \text{units}
  4. D9.4×105units9.4 \times {10}^{5} \text{units}

Correct answer

A. 39.5×105units39.5 \times {10}^{5} \text{units}

Step-by-step solution

d=2Rhd = \sqrt{2Rh}

N=\pid2σ=2\piRhσN = \pid^{2} \sigma = 2\piRh\sigma

=2×3.14×6400×0.1×1000= 2 \times 3.14 \times 6400 \times 0.1 \times 1000

=2×3.14×6.4×105=39.5×105units= 2 \times 3.14 \times 6.4 \times {10}^{5} = 39.5 \times {10}^{5} \text{units}
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