In si units, the electric field in an electromagnetic wave is described by ey = 104 sin(1.40 107x − ωt). (a) find the amplitude of the corresponding magnetic field oscillations. µt (b) find the wavelength λ. µm (c) find the frequency f.

Answers:
(a) μT
(b) μm
(c) f = 

Explanation:
Given electric field(in y direction) equation:


(a) The amplitude of electric field is . Hence

The amplitude of magnetic field oscillations is 
Where c = speed of light

Therefore,
μT (Where T is in seconds--signifies the oscillations)

(b) To find the wavelength use:


μm

(c) Since c = fλ
=> f = c/λ

Now plug-in the values
f = (3*10^8)/(0.4488*10^-6)
f = 

The answer would be a