What is the relation between amplitudes of electric and magnetic field in free space for e.m. wave?

The amplitude of electric and magnetic fields related to each other are:

The electric and magnetic fields in an electromagnetic wave are

Write down a relation between electric flux and electric field intensity.

What is the relationship between e.m.f. and magnetic flux?

What is the relation between frequency, wavelength and wave velocity ?

An electromagnetic wave is travelling in a medium with a velocity vecv=v hati . The electric field oscillations, of this electromagnetic wave, all along the Y-axis. How are the magnitude of the electric and magnetic fields in the electromagnetic wave related to each other?