May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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30Standing WavesHard1 mark
A microwave source is placed on a horizontal surface at position X.
A shiny metal sheet is placed at position Y that is a distance of 0.48 m from X.
a microwave source at position X on a horizontal surface, a microwave detector on a small stand placed between X and Y, and a metal sheet standing upright at position Y, a distance of 0.48 m from X
The microwaves are reflected back from the metal sheet towards the source.
A microwave detector is moved from X to Y and all positions of minimum microwave intensity are recorded.
Intensity minima were detected at X and Y and also at 15 positions in between X and Y.
The speed of the microwaves is m s.
What is the frequency of the microwaves emitted by the source?