Question

which is the correct sequence for these types of radiation in order of increasing energy per photon.

Explanation:

The energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength. Microwaves have the longest wavelength and lowest frequency among the given radiations, so they have the lowest energy per photon. Ultraviolet radiation has a higher frequency than microwaves. X - rays have a higher frequency than ultraviolet radiation. Gamma rays have the highest frequency and thus the highest energy per photon among them.

Answer:

C. microwave radiation < ultraviolet radiation < X - rays < gamma rays