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Manipal MET2013PhysicsNuclear Physics

The energy supplied to Kolkata by the state electricity board during an average November week day was 40 GWh . If this energy could be obtained by the conservation of matter, how much mass would have to be annihilated?

Options

  1. A1.6 ~g
  2. B2.2 g
  3. C4.0 g
  4. D1.6 kg

Correct answer

A. 1.6 ~g

Step-by-step solution

aligned E-40 GWh & =40 10^9 ~J / s (60 60) & =1.44 10¹⁴ ~J E & =m c^2 m= E c^2 & = 1.44 10¹⁴ (3 10^8 )^2 =1 10^3 ~kg m & =1.6 ~g aligned

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