A-Level Physics Specification

OCR A H556

Section 4.5.1: Photons

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#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