The speed of EM wave is the product of the wavelength and frequency of the wave. Option B is correct.
Electromagnetic wave:
It is the oscillation of the electric and magnetic wave perpendicular to the direction of wave. Hence, EM wave is a transverse waves.
The speed is the EM wave can be calculated by the formula,
[tex]\bold {v = \lambda F}[/tex]
Where,
v - speed
[tex]\lambda[/tex] - wavelength
F - frequency
Therefore, the speed of EM wave is the product of the wavelength and frequency of the wave.
To know more about EM waves,
https://brainly.com/question/1077639
