The Total solution for NCERT class 6-12
The terminology of differentparts of the electromagnetic spectrum is given in the text. Use the formula E = hν (forenergy of a quantum of radiation: photon) and obtain the photon energy in unitsof eV for different parts of the electromagnetic spectrum. In what way are thedifferent scales of photon energies that you obtain related to the sources ofelectromagnetic radiation?
Energy of a photon is given as:
Where,
h = Planck’s constant = 6.6 × 10−34 Js
c = Speed of light = 3 × 108 m/s
λ =Wavelength of radiation
The given table lists the photonenergies for different parts of an electromagnetic spectrum for differentλ.
λ (m)
103
1
10−3
10−6
10−8
10−10
10−12
E (eV)
12.375 × 10−10
12.375 × 10−7
12.375 × 10−4
12.375 × 10−1
12.375 × 101
12.375 × 103
12.375 × 105
The photon energies for thedifferent parts of the spectrum of a source indicate the spacing of therelevant energy levels of the source.