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Radioactive decay of granite and other rocks in the Earth’s interior provides sufficient energyto keep the interior molten, to heat lava and to provide warmth to hot springs. This is due tothe average...

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Radioactive decay of granite and other rocks in the Earth’s interior provides sufficient energyto keep the interior molten, to heat lava and to provide warmth to hot springs. This is due tothe average release of about 0.03J per kilogram of granite each year. How many years arerequired for a “chunk” of thermally insulated granite to increase in temperature by 400°C.The specific heat capacity of granite is 800J/Kg°C.
Answered Same Day Dec 22, 2021

Solution

Robert answered on Dec 22 2021
114 Votes
SOLUTION
Data given
Average release heat = 0.03 J per Kg of granite each year
Increase in temperature ∆T = 400 °C
Specific heat capacity of granite = 800 J/Kg °C
Let mass of chunk = m = 1 kg
Heat required raising the required temperature
Q= m C ∆T
Q= 1x 800 x 400
Q= 320000 J...
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