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An earthen pitcher used in summer cools ...

An earthen pitcher used in summer cools water in it essentially by evaporation of water from its porous surface. If a pitcher carries `4 kg` water and the rate of evaporation is `20 g` per hour, temperature of water in it decreases by `/_\T` in two hours. The value of `/_\T` is close to (ratio of latent of evaporation to specific heat of water is `540^(@)C`)

A

`2.7^@C`

B

`4.2^@C`

C

`5.4^@C`

D

`10.8^@C`

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