Physics (AS & A Level) · Oct / Nov 2016 · Paper 12 · Question 29

A microwave transmitter is placed at a fixed distance from a flat reflecting surface, as shown. [diagram: microwave transmitter, microwave detector, movement of detector, reflecting surface, X, Y] A microwave detector is moved steadily in a straight line from X to Y. A series of maxima and minima of intensity is obtained. The distance between adjacent maxima is 1.5 cm. What is the frequency of the microwave radiation?

1. A1.0 × 10^8 Hz
2. B2.0 × 10^8 Hz
3. C1.0 × 10^10 Hz
4. D2.0 × 10^10 Hz

As printed in the paper