Modern Physics

Topic overview

Photoelectric effect, radioactivity, nuclear reactions, wave–particle duality

Discontinued, retained only as historical foundation training; not to be treated as a current ESAT question bank or full mock exam.

Key points

◆Follow the prerequisite knowledge requirements given by the examination body; new concepts may only be used when the question provides sufficient guidance.
◆The examples on this site are training with a limited scope and do not represent full syllabus coverage or official difficulty.

Try each example yourself before checking the explanation.

1Basic examples within scope

A photon has frequency $5\times10^{14}\,\text{Hz}$ . Using $h=6.6\times10^{-34}\,\text{J·s}$ , its energy (in $10^{-20}\,\text{J}$ ) is:

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