A-Level Physics OCR A H556

4.5.1: Photons

#4.5.1a

the particulate nature (photon model) of electromagnetic radiation

#4.5.1b

photon as a quantum of energy of electromagnetic radiation

#4.5.1c

energy of a photon; $E = hf$ and $E = \dfrac{hc}{λ}$

#4.5.1d

the electronvolt (eV) as a unit of energy

#4.5.1e

(i) using LEDs and the equation $eV = \dfrac{hc}{λ}$ to estimate the value of Planck constant h

No knowledge of semiconductor theory is required.

(ii) Determine the Planck constant using different coloured LEDs.

PAG6

4.4.4

Stationary waves

4.5.2

The photoelectric effect