Question

calculate the no. of photons of wavelength λ=5×10^-5 cm whose energy is equal to the energy of photon of wavelength λ²: 3×10^-12 cm.​

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.

mark me as a brain list

And follow me