Question

Pick out the correct increasing order of energy of electromagnetic waves from the following.

(a) Einfrared < Emicro < Evisible < Eultraviolet < Egamma

(b) Emicro < Einfrared < Evisible < Eultraviolet < Egamma

(c) Emicro < Einfrared < Evisible < Egamma < Eultraviolet

(d) Emicro < Einfrared < Eultraviolet < Evisible < Egamma

I have been asked this question by my college director while I was bunking the class.

Query is from Electromagnetic Spectrum in portion Electromagnetic Waves of Physics – Class 12

Answer 1

Correct choice is (b) Emicro < Einfrared < Evisible < Eultraviolet < Egamma

The best I can explain: The energy of electromagnetic waves is directly proportional to the frequency of the electromagnetic waves. So the order of frequency is given as:

vmicro < vinfrared < vvisible < vultraviolet < vgamma

Since E=hv ➔ E ∝ v

The order of energy is as follows:

Emicro < Einfrared < Evisible < Eultraviolet < Egamma