is temperature of surroundings in K, the...

is temperature of surroundings in K, then the value of K on the basis of Stefan-Boltzmann law is `4^@C//mt` and when the temperature becomes `50^@C` the rate of cooling becomes `2^@C//mt`. The temperature of surroundings is –

`35^@C`

`25^@C`

`30^@C`

`20^@C`

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