The table shows the properties of three particles.
| Particle | Relative mass | Relative charge |
|---|---|---|
| P | 1 | +1 |
| Q | 11840\displaystyle \frac{1}{1840}18401 | +1 |
| R | 11840\displaystyle \frac{1}{1840}18401 | -1 |
Which identifies Q and compares its mass with P?
Q is a positron; P is about 1840 times heavier.
Q is a proton; P is about 1840 times heavier.
Q is a positron; P has approximately the same mass.
Q is a proton; P has approximately the same mass.
103 exam-style questions on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one has a worked solution and a mark scheme showing where the marks go.