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1 markNature of Heat

CSEC Physics · 1992 · Paper 2 · Question 3(a)(i)

Mass-energy conservation, mass-energy equivalence, and nuclear fission.

Name the scientist referred to in the statement about the total amount of mass-energy remaining constant.

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Other parts of this question

  1. 3(a)(ii)Give the equation for the mass-energy relationship in a nuclear reaction. State clearly what EACH symbol represents.[3 marks]
  2. 3(b)(i)What is the total mass of the uranium nucleus and the neutron?[1 mark]
  3. 3(b)(ii)What is the total mass of the two nuclei and the two neutrons produced as a result of the fission of 235_92 U?[2 marks]
  4. 3(b)(iii)How much energy is produced as a result of the fission reaction? (Speed of light = 3.0 x 10^8 m s^-1)[3 marks]
  5. 3(c)(i)State TWO DISADVANTAGES of generating electrical energy using nuclear fission reactors.[2 marks]
  6. 3(c)(ii)Scientists estimate that every second the sun's mass is reduced by 4 x 10^9 kg. Name and explain the process that leads to this reduction in mass.[4 marks]

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