Question

What are the frequencies of photons that have the following energies?

(a) 1.11 eV
Hz

(b) 0.91 keV
  Hz

(c) 1.05 MeV
  Hz

Answer 1

here,

a)

the energy of photon , E = 1.11 eV

let the frequency of photon be f

energy , E = h * f

1.11 * 1.6 * 10^-19 = 6.634 * 10^-34 * f

solving for f

f = 2.68 * 10^14 Hz

b)

the energy of photon , E = 0.91 KeV

let the frequency of photon be f

energy , E = h * f

910 * 1.6 * 10^-19 = 6.634 * 10^-34 * f

solving for f

f = 2.19 * 10^17 Hz

c)

the energy of photon , E = 1.05 MeV

let the frequency of photon be f

energy , E = h * f

1.05 * 10^6 * 1.6 * 10^-19 = 6.634 * 10^-34 * f

solving for f

f = 2.53* 10^20 Hz