Question

A sinusoidal electromagnetic wave from a radio station passes perpendicularly through an open window that has area of 0.700 m2 . At the window, the electric field of the wave has an rms value 0.0400 V/m .
How much energy does this wave carry through the window during a 30.0-s commercial?
Express your answer with the appropriate units.

Answer 1

Answer:

The  value is  $E = 8.9 *10^{-5} \ J$

Explanation:

From the question we are told that

   The  area is  $A = 0.700 \ m^2$

   The  root mean square value  is $E_{rms} = 0.0400 \ V/m$

   The time taken is $t = 30.0 \ s$

Generally the energy is mathematically represented as

     $E = c * \sepsilon_o * A * t * E_{rms}^2$

=>    $E = 3.0*10^{8} * 8.85*10^{-12} * 0.700 * 30 * (0.04)^2$

=>     $E = 8.9 *10^{-5} \ J$