A double-slit is used in an interference experiment to independently investigate the light from two sources P and Q. The light from the sources has different wavelengths. The table below shows some data.
| Light source | Wavelength of light | Separation between adjacent bright fringes | Distance between screen and double-slit |
|---|---|---|---|
| P | λ\lambdaλ | 2.0 mm | DDD |
| Q | 1.5λ1.5\lambda1.5λ | 0.60D0.60D0.60D |
What is the separation between adjacent bright fringes for source Q?
0.90 mm0.90\text{ mm}0.90 mm
1.8 mm1.8\text{ mm}1.8 mm
2.0 mm2.0\text{ mm}2.0 mm
5.0 mm5.0\text{ mm}5.0 mm
26 exam-style questions on OCR A A Level Physics Waves, covering Wave motion, Electromagnetic waves, Superposition, and Stationary waves. Each one has a worked solution and a mark scheme showing where the marks go.