Photon Physics Example
What is a photon?
A photon is a wave packet of energy such as in electromagnet
Below is an illustration of the relationship
between E, the energy of a photon and its wavelength
where E is measured in J and the wavelength is measured in
If two metal electrodes A and B are sealed
into an evacuated glass envelope and a potential difference V,
measured using the voltmeter, is applied between them as shown
B is then illuminated with monochromatic
light of wavelength 365 nm and I, the current in the circuit,
is measured for various values of V. The results are shown
From this graph, deduce the p.d. required to
stop photoelectric emission from B.
Calculate the maximum kinetic energy of the