An electromagnetic wave of wavelength 435 nm is traveling in vacuum in the –z direction. the electric field has an amplitude of 2.70×10−3v/m and is parallel to the x axis. what are the frequency and the magnetic-field amplitude of this wave?

(a) frequency of the wave

The electromagnetic wave travels at the speed of light: . Since its wavelength is , we can find the frequency of the wave by using the relationship between f,  and c:


(b) magnetic field amplitude

The relationship between the electric field amplitude E, the magnetic field amplitude B and the speed of light c for an electromagnetic wave is

And since we know E, by re-arranging the equation we can find the magnitude of B:

Iwould sure like to answer your question but i honestly just don’t know