Physics (AS & A Level) · May / June 2023 · Paper 11 · Question 23

Some sources of electromagnetic waves in free space are listed. 1 a radio wave transmitter 2 a source of X-rays 3 a 30 mm wavelength radar transmitter 4 a light-emitting diode that emits red light Which list gives the sources in order of increasing wavelength, from left to right, of the waves emitted by the sources?

1. A1 → 3 → 4 → 2
2. B2 → 4 → 1 → 3
3. C2 → 4 → 3 → 1
4. D3 → 1 → 4 → 2

As printed in the paper