May/June 2026 Paper 22

2026 · 6 questions · 32 parts · 60 marks

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6(a)Nuclear Model AtomMedium1 mark

One of the conclusions from the α-particle scattering experiment was that the atom is mostly empty space.

State the observation from the experiment that provides evidence for this conclusion.

6(b)(i)Momentum Impulse CollisionsEasy2 marks

An α-particle travelling with a speed of

5.60 \times 1 0^{6}

m s

^{- 1}

collides with a stationary gold nucleus of mass 197 u. After the collision, the α-particle is travelling with a speed of

5.38 \times 1 0^{6}

m s

^{- 1}

in the opposite direction to its initial motion.

No external forces act on this system.

Show that the momentum of the α-particle before the collision is

3.72 \times 1 0^{- 20}

kg m s

^{- 1}

Draw with the mouse or a finger.

6(b)(ii)Momentum Impulse CollisionsEasy2 marks

Use conservation of momentum to calculate the speed of the gold nucleus after the collision.

6(b)(iii)Measurement Uncertainty ErrorEasy2 marks

The absolute uncertainty in each of the measured speeds of the α-particle is

\pm 5 \times 1 0^{4}

m s

^{- 1}

Calculate the percentage uncertainty in the change in velocity of the α-particle.

6(c)Quarks Leptons AntiparticlesEasy1 mark

Determine the number of up quarks in a nucleus of

_{1}^{2} H

Number of up quarks

6(d)Quarks Leptons AntiparticlesEasy1 mark

Describe the general quark composition of a meson.

Answer

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