Three solid copper spheres, P, Q, and R, are heated to the same temperature.
| Sphere | Diameter | Surface finish |
|---|---|---|
| P | DDD | shiny silver |
| Q | 3D3D3D | shiny silver |
| R | 3D3D3D | matte black |
Which of the following correctly shows the order of the spheres from the highest rate of emission of thermal radiation to the lowest rate of emission?
R, Q, P
R, P, Q
Q, R, P
P, Q, R
99 exam-style questions on CIE IGCSE Physics 2.3.3a Thermal radiation. Each one has a worked solution and a mark scheme showing where the marks go.