write down the momentum of the neutrino.

show that the energy of the pion is about 140 MeV.

State the rest mass of the pion with an appropriate unit.

«–»29.8 «MeVc^–1»

[1 mark]

E_π = \(\sqrt {p_\mu ^2{c^2} + m_\mu ^2{c^4}} \) + p_vc OR E_μ = 109.8 «MeV»

E_π = «\(\sqrt {{{29.8}^2} + {{105.7}^2}} \) + 29.8 =» 139.6 «MeV»

Final value to at least 3 sig figs required for mark.

[2 marks]

139.6 MeVc^–2

Units required.

Accept 140 MeVc^–2.

[1 mark]