JEE Main2006PhysicsElectromagnetic WavesActual
The rms value of the electric field of the light coming from the Sun is 720 ~N / C . The average total energy density of the electromagnetic wave is
Options
- A3.3 10⁻³ ~J / m ^3
- B4.58 10⁻⁶ ~J / m ^3
- C6.37 10⁻⁹ ~J / m ^3
- D81.35 10⁻¹² ~J / m ^3
Correct answer
B. 4.58 10⁻⁶ ~J / m ^3
Step-by-step solution
U_ a v = ₀ E_ rs ^2=4.58 10⁻⁶ ~J / m ^3E_ rms =4.58 10⁻⁶ ~J / m ^3