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The temperature gradient in the earth's ...

The temperature gradient in the earth's crust is `32.^@Ckm^-1 ` and the mean conductivity of earth is `0.008 cal s^(-1)cm^(-1) .^@C^(-1)` . Considering the earth to be a sphere of radius 6000 km , the loss of heat by the earth every day is about

A

`10^(30)" cal"`

B

`10^(40)" cal"`

C

`10^(20)" cal"`

D

`10^(18)" cal"`

Text Solution

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The correct Answer is:
D
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