Question

Two of the types of infrared light, IR-C and IR-A, are both components of sunlight. Their wavelengths range from 3000 to 1,000,000 nm for IR-C and from 700 to 1400 nm for IR-A. Compare the energy of microwaves, IR-C, and IR-A.

Answer 1

According to Planck's quantum theory, the energy of an electromagnetic radiation is given as

E = h = hc /

Hence energy of an electromagnetic radiation is inversely proportional to the wave length(). Hence higher is the wave length lower is the energy.

The wavelength range of microwave = 1000000 nm to 300000000 nm (highest and lowest energy )

Wave length range of IR-C : 3000 nm to 1000000 nm

Wave length range of IR-A : 700 mn to 1400 nm (lowest and highest energy)

Hence order of energy is

IR-A > IR-C > microwave