The mass defect in a particular reaction is 0.4 g. The amount of energy liberated is kWh, where n = ______. (speed of light = m/s)

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Solution

Q.
The mass defect in a particular reaction is 0.4 g. The amount of energy liberated is $n \times 10^{7}$ kWh, where n = ______. (speed of light = $3 \times 10^{8}$ m/s) [2024]

Ans.
(1) $E = Δ m c^{2}$

$= 0.4 \times 10^{- 3} \times {(3 \times 10^{8})}^{2} = 3600 \times 10^{7} kWs$

$= \frac{3600 \times 10^{7}}{3600} kWh = 1 \times 10^{7} kWh$

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