The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula `E= h upsilon` (for energy of a quantum of radiation : photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation ?

Explanation

Given : Frequency of `gamma `- rays = 3` xx 10^(20)` Hz
fromula :
Energy of gamma rays,
E = h`gamma`
= `6.63 xx 10^(-34) xx 3 xx 1020`
E = `19.8 xx 10^(-14) `J
`therefore [ "leV" = 1.6 xx 10-19 J , 1 " T" = (1)/(1.6 xx 10^(-19)) eV ] `
Solution:
E = `(19.8 xx 10^(-14))/(1.6 xx 10^(-19))`
E = `1.24 xx 10^(6)` eV