NTA Abhyas JEE Main2020PhysicsCommunication SystemPractice
The height of a TV antenna is 200 m . The population density is 4000 k m - 2 . Find the population benefited
Options
- A3.2 × 10 8
- B3.2 × 10 7
- C3.2 × 10 6
- D3.2 × 10 5
Correct answer
B. 3.2 × 10 7
Step-by-step solution
d = 2 h R ; Population converted = π d 2 × population density = π ( 2 R h ) × ρ = 22 7 × 2 × 6400 × 0.2 × 4000 = 3.2 × 10 7