Question

When a distant star explodes, a visible light telescope and s radio telescope located on earth receive signals from the exploding star at the same time

which feature of the electromagnetic theory does the evidence support

A. Visible light waves are more energetic than radio waves

B. Radio wavelengths are longer than visible light wavelengths

C. Electromagnetic radiation can have a wide range of frequencies

D. The speed of electromagnetic waves is independent on wavelength

Answer 1

the correct answer is D

Step-by-step explanation:

When the star explodes the radiation travels through empty space at the speed of light c= 3 10⁸ m/s

This speed has been experimentally proven to be constant, therefore two two instruments arrive at the same time

Therefore the correct answer is D