An electromagnetic wave is given by E(x,t)=40 , (2 10^ 7 t-0.21 x ) ; V m ^ -1
PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics
Problem
An electromagnetic wave is given by
E(x,t)=40sin(2π×107t−0.21πx)V m−1,
with x in metres and t in seconds. Solve the following:
(i) State the direction of propagation of the wave and calculate its speed.
(ii) Compute the phase difference between points A(1.2m) and B(3.6m) at the instant t=0.
(iii) What is the earliest time after t=0 at which the electric field at point A attains its maximum positive value? Show all working clearly.