Question

What is the energy of photons that corresponds
to a wave number of 2.5x10-5cm-1​

Answer 1

Answer:

We know that wave number is reciprocal of the wavelength.

Wave number =

λ

1

=2.5×10

−5

cm

−1

Speed of light (c ) =3×10

8

ms

−1

= 3×10

10

cm.s

−1

and h=6.626×10

−27

erg.s

According to planck's theory, E=

λ

hc

=6.626×10

−27

×3×10

10

×2.5×10

−5

=5.0×10

−21

erg

Hence, the energy of photons is 5.0×10

−21

erg.