For this question, visible light has wavelengths from 400 nm400\ \mathrm{nm}400 nm to 700 nm700\ \mathrm{nm}700 nm.
| Radiation | Wavelength |
|---|---|
| P | 0.35 μm0.35\ \mu\mathrm{m}0.35 μm |
| Q | 0.55 μm0.55\ \mu\mathrm{m}0.55 μm |
| R | 0.85 μm0.85\ \mu\mathrm{m}0.85 μm |
There are 1000 nm1000\ \mathrm{nm}1000 nm in 1 μm1\ \mu\mathrm{m}1 μm.
Which row identifies the radiations correctly?
P is infrared; Q is visible; R is ultraviolet.
P is ultraviolet; Q is visible; R is infrared.
P is visible; Q is infrared; R is ultraviolet.
P is ultraviolet; Q is infrared; R is visible.
84 exam-style questions on Edexcel GCSE Physics 5.2 The electromagnetic spectrum, covering 5.2.1 Electromagnetic waves and refraction in glass (core practical), 5.2.2 Groups of the electromagnetic spectrum, 5.2.3 Wavelength-dependent behaviour of EM waves, and 5.2.4 Velocities of EM waves in different substances. Each one has a worked solution and a mark scheme showing where the marks go.