Physics (AS & A Level) · Oct / Nov 2020 · Paper 12 · Question 28

A transmitting mast sends out microwaves of wavelength 1.5 cm and radio waves of wavelength 1.5 km. A receiving aerial behind a mountain can detect the radio waves but not the microwaves. What is the reason for this?

1. AThe radio waves are coherent but the microwaves are not.
2. BThe radio waves are diffracted around the mountain but the microwaves are not.
3. CThe radio waves are reflected by the mountain but the microwaves are not.
4. DThe radio waves travel at the speed of light but the microwaves do not.

As printed in the paper