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The amount of energy released when 0.5kg of uranium is burnt completely is [c =...

Physics
JAMB 2005

The amount of energy released when 0.5kg of uranium is burnt completely is [c = 3 x 10\(^8\)m/s]

  • A. 1.5 x 10\(^8\)J
  • B. 4.5 x 10\(^8\)J
  • C. 1.5 x 10\(^{16}\)J
  • D. 4.5 x 10\(^{16}\)J
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Correct Answer: Option D
Explanation

To calculate the amount of energy released when 0.5 kg of uranium is completely burnt, we use Einstein's mass-energy equivalence formula:

\(E = mc^2\)

Given: Mass of uranium (\( m \)) = 0.5 kg, Speed of light (\( c \)) = \( 3 \times 10^8 \, \text{m/s} \)
Substituting the values into the formula:

\(E = 0.5 \, \text{kg} \times (3 \times 10^8 \, \text{m/s})^2\)

Calculating \( c^2 \):

\((3 \times 10^8)^2 = 9 \times 10^{16} \, \text{m}^2/\text{s}^2\)

Now, substituting back:

\(E = 0.5 \times 9 \times 10^{16} = 4.5 \times 10^{16} \, \text{J}\)

The amount of energy released when 0.5 kg of uranium is burnt completely is  \(E = 4.5 \times 10^{16} \, \text{J}\)

There is an explanation video available below.


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Explanation Video

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