A student investigates how much light is reflected by different surfaces. A ray of light is shone at each surface and a light sensor measures the percentage of the light that is reflected. Table shows the results.
Table: The percentage of the light reflected by four different surfaces
| Surface | Percentage of light reflected in % |
|---|---|
| Plane mirror | 92 |
| White card | 68 |
| Grey card | 31 |
| Matt black card | 4 |
Give two variables that the student must control in this investigation.
Use Table to give two conclusions about the reflection of light by different surfaces.
Only 4 % of the light is reflected by the matt black card. Explain what happens to the rest of the light.
The plane mirror produces a clear image but the white card does not, even though both surfaces reflect most of the light. Explain why.
40 exam-style questions on AQA GCSE Physics 6.1 Waves in air, fluids and solids, covering 6.1.1 Transverse and longitudinal waves, 6.1.2 Properties of waves, 6.1.3 Reflection of waves, 6.1.4 Sound waves (HT only), and 6.1.5 Waves for detection and exploration (HT only). Each one has a worked solution and a mark scheme showing where the marks go.