Explain how a linear accelerator accelerates protons and why the drift tubes get longer along the accelerator.
From Paper 1: Advanced Physics I
16(b)4 marks
Particle tracks are seen in a bubble chamber in a uniform magnetic field. Explain what the curvature of tracks tells you, and why some tracks spiral inwards.
From Paper 1: Advanced Physics I
16(c)3 marks
The Σ⁺ baryon has quark composition uus and the π⁺ meson is ud̄. Show that both have charge +1 and state the strangeness of each.
From Paper 1: Advanced Physics I
16(d)4 marks
A proton and an antiproton at rest annihilate, producing two photons. Calculate the energy and wavelength of each photon. (Proton rest energy 938 MeV)
From Paper 1: Advanced Physics I
16(e)*6 marks
Describe the alpha-particle scattering experiment and explain how its results led to the nuclear model of the atom.
From Paper 3: General and Practical Principles in Physics
6(a)4 marks
Sodium-23 ions (charge +e, mass 3.82 × 10⁻²⁶ kg) are accelerated through 1500 V and enter a 0.25 T magnetic field at right angles. Calculate their speed and the radius of their path.
From Paper 3: General and Practical Principles in Physics
7(a)4 marks
In the Sun, 4 ¹H → ⁴He + 2e⁺ + 2ν. Mass of ¹H nucleus 1.007276 u, ⁴He nucleus 4.001506 u, positron 0.000549 u. Calculate the energy released in MeV (1 u = 931.5 MeV).
Score 0 / 30 · 0 of 8 marked
This paper is written by Plasmo in the style of the Edexcel A-Level Physics exam. It is not a past paper and is not produced or endorsed by the exam board.