The Einstein–Planck relation for a photon states .
PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter
Problem
The Einstein–Planck relation for a photon states E=hf .
(1) State the meaning of the term *photon*.
(2) State what each of the terms in the relation mean and its unit.
(3) Show that the Einstein–Planck relation can also be expressed as E=hλc .
(4) Photon energies are often quoted in electronvolts, eV. Define the term *electronvolt*.
(5) Calculate the energy of the following photons; give your answer in Joules and in eV.
- i A red photon of wavelength 630 nm
- ii A green photon of wavelength 532 nm
- iii A blue photon of wavelength 430 nm