Waves & Optics

Topic overview

Interference, diffraction, refraction, polarisation, Doppler effect

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 wave has frequency $50\,\text{Hz}$ and wavelength $4\,\text{m}$ . Its speed is:

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