A hollow metal cube is filled with boiling water. Side P of the cube is opposite Side Q. One of these two sides is painted matte black and the other is polished silver. A thermal radiation sensor is placed 10 cm from Side P, and then the same sensor is placed 10 cm from Side Q. The sensor detects a much higher rate of thermal radiation when facing Side P than when facing Side Q.
Which row in the table correctly identifies the matte black side and compares the rate of emission of thermal radiation from each side?
| Matte black side | Rate of emission of thermal radiation | |
|---|---|---|
| A | P | greater for P |
| B | P | the same for P and Q |
| C | Q | greater for Q |
| D | Q | the same for P and Q |
Matte black side: P; rate of emission of thermal radiation: greater for P
Matte black side: P; rate of emission of thermal radiation: the same for P and Q
Matte black side: Q; rate of emission of thermal radiation: greater for Q
Matte black side: Q; rate of emission of thermal radiation: the same for P and Q
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.