Describe β⁻ decay in terms of quarks and exchange particles. Include an equation for the decay of a neutron.
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1(b)3 marks
Show that K⁺ → μ⁺ + ν_μ conserves charge and lepton number, and explain why it must be a weak interaction.
From Paper 1
1(c)3 marks
Calculate the maximum wavelength of a photon that can produce an electron–positron pair. (rest energy of electron = 0.511 MeV)
From Paper 1
2(a)4 marks
Explain why the photoelectric effect cannot be explained by a wave theory of light.
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2(b)3 marks
Light of wavelength 250 nm falls on a metal with work function 4.3 eV. Calculate the stopping potential.
From Paper 1
91 mark
What is the specific charge of a proton?
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101 mark
Which particle is a lepton?
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111 mark
Which quark combination is a neutron?
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121 mark
What is the energy of a photon of wavelength 500 nm?
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131 mark
Photons of 3.1 eV hit a metal with work function 2.3 eV. What is the maximum kinetic energy of the electrons?
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141 mark
What is the de Broglie wavelength of an electron moving at 2.0 × 10⁶ m s⁻¹?
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311 mark
Which is conserved in the strong interaction but not in the weak interaction?
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321 mark
An electron in hydrogen falls from −3.40 eV to −13.6 eV. The emitted photon is in the:
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Particles and radiation Exam Questions: AQA A-Level Physics | Plasmo