Question

Calculate the frequency of a photon with energy 7.5 ev. ( 1 ev = 1.6 X 10-19 J, h= 6.63X10-34J)​

Answer 1

Answer:

frequency of photon

μ  =1.809×10¹⁵ Hz

Explanation:

given

energy of photon given E = 7.5 ev

we know

E = hμ

where h = 6.63×10⁻³⁴

μ = frequency of photon

E = 6.63×10⁻³⁴ ×μ

7.5 ×1.6×10⁻¹⁹ = 6.63×10⁻³⁴ ×μ

7.5 ×1.6×10⁻¹⁹/ 6.63×10⁻³⁴ = μ

12×10⁻¹⁹/6.63×10⁻³⁴= μ

μ  =1.809×10¹⁵ Hz

frequency of photon

μ  =1.809×10¹⁵ Hz

Answer 2

Answer:

frequency of the 1 eV photon.

E = hf,

so f = E/h.

Hence,

f = 1 eV/6.63 x 10-34 Joule-sec x (1.6 x 10-19 Joule / 1 eV) = 2.41 x 1014 sec-1 or 2.41 x 1014 Hz ( Hz means 1/sec).