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A lake is covered with ice 5 cm thick an...

A lake is covered with ice 5 cm thick and the atmospheric temperature above the ice is` – 10^(@)C`. At what rate (in cm/hour) will the ice layer thicken? Thermal conductivity of ice `= 0.005` cgs unit, density of ice `= 0.9 g//cc` and latent heat of fusion of ice = 80 cal/g.

A

`0.5"cm hr"^(-1)`

B

`1.5"cm hr"^(-1)`

C

`2.5"cm hr"^(-1)`

D

`3.5"cm hr"^(-1)`

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Verified by Experts

The correct Answer is:
A
`0.5"cm hr"^(-1)`
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