In a room where the temperature is 3 0 ∘ C, a body cools from 6 1 ∘ C to 5 9 ∘ C in 4 minutes. The time taken by the body to cool from 5 1 ∘ C to 4 9 ∘ C will be:

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumsingle choice

In a room where the temperature is $3 0^{\circ}$ C, a body cools from $6 1^{\circ}$ C to $5 9^{\circ}$ C in 4 minutes. The time taken by the body to cool from $5 1^{\circ}$ C to $4 9^{\circ}$ C will be:

Options:

Answer:

Solution:

The time is inversely proportional to the mean excess over the room temperature: first $30$ , second $20$ . $t = 4 \times \frac{30}{20} = 6$ minutes. B.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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