A ray travels from substance P into substance Q at a non-zero angle to the normal.
| Substance | Speed of the light |
|---|---|
| P | 2.4 × 108 m/s |
| Q | 1.8 × 108 m/s |
Which statement describes the ray in Q?
It bends towards the normal and its wavelength becomes 0.750.750.75 of its value in P.
It bends away from the normal and its wavelength becomes 0.750.750.75 of its value in P.
It bends towards the normal and its wavelength becomes 1.331.331.33 of its value in P.
It bends away from the normal and its wavelength becomes 1.331.331.33 of its value in P.
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.