In vacuum, the components of an EM wave are E_y = (50 V/m) cos [(5.00 m⁻¹)x + ωt], E_x = 0, and E_z = 0. What is ω? A) 1.50 × 10⁹ rad/s B) l.20 × 10⁹ rad/s C) 1.00 × 10⁹ rad/s D) 8.00 × 10⁸ rad/s E) More information is needed.

Question

Quizplus · Accepted Answer

We know that the equation for the EM wave is ES1U1B1yS1U1B0 = (50 V/m) cos [(5.00 mS1U1P1−1S1S1P0)x + ωt]. 
Comparing it with the standard equation, we can see that the angular frequency, ω, is the coefficient of t. Therefore, ω = 5.00 mS1U1P1−1S1S1P0 = 5.00 × 10S1U1P6S1S1P0 rad/s. Converting it to scientific notation, we get 1.50 × 10S1U1P19S1S1P0 rad/s, which is option A.

In Vacuum, the Components of an EM Wave Are Ey

In Vacuum, the Components of an EM Wave Are E_y