A protostar has a radius of 2.0 × 109 m and a central temperature of 4.0 × 106 K. No nuclear fusion is taking place in it yet.
Four students each predict the radius and central temperature of the protostar a short time later, before nuclear fusion begins.
| Prediction | Radius in m | Central temperature in K |
|---|---|---|
| P | 1.5 × 109 | 4.0 × 106 |
| Q | 2.0 × 109 | 8.0 × 106 |
| R | 3.0 × 109 | 4.0 × 106 |
| S | 1.5 × 109 | 8.0 × 106 |
Which prediction is consistent with the changes caused by gravity?
Prediction P
Prediction S
Prediction R
Prediction Q
75 exam-style questions on Edexcel GCSE Physics 7.3 Stars, covering 7.3.1 Evolution of stars similar to the Sun, 7.3.2 Evolution of massive stars, and 7.3.3 Observing the Universe. Each one has a worked solution and a mark scheme showing where the marks go.