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6.5 Uses and dangers of radioactivity

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Question 33

The energy, EEE, released in nuclear fusion is equivalent to the loss in mass, mmm, according to the equation:

E=mc2 E = mc^2 E=mc2

where c c\,c is the speed of light:

c=3.00×108 m/s c = 3.00 \times 10^8 \text{ m/s} c=3.00×108 m/s

In 1 second, the energy radiated by the massive star Vega is 1.80 × 1028 J.

Calculate the loss in mass of Vega in 1 second.

[2]
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6.5 Uses and dangers of radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6.5 Uses and dangers of radioactivity

94 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity, covering 6.5.1 Uses of radioactivity, 6.5.2 Dangers of ionising radiation and precautions, 6.5.3 Half-life and radiation dangers, 6.5.4 Safety precautions for radiation exposure, and 6.5.5 Contamination and irradiation. Each one has a worked solution and a mark scheme showing where the marks go.

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