Question

The energy of an electromagnetic radiation is 3 x 10-2 ergs. What is its wave-length in nano meters?
(a) 400
(b) 228.3
(c) 3000
(d) 6625​

Answer 1

Answer:

Erg is the dimension of energy in CGS (centimeter-gram-second) system of units.

Therefore, 1erg=10

−7

joules.

Now, the energy of photon is 3 x 10

−19

J.

Using E=

λ

h×c

,

Wavelength (nm)=

3×10

−19

J

3×10

8

m/s×6.626×10

−34

Js=662nm