Ice starts forming in a lake with water at 0 ∘ C when the atmospheric temperature is − 1 0 ∘ C. If the time taken for 1 cm of ice to be formed is 7 hours, the time taken for the thickness of ice to change from 1 cm to 2 cm is:

t ∝ x 2 . Time for 2 cm is 4 × 7 = 28 h. From 1 cm to 2 cm it takes 28 − 7 = 21 h. D.

Start Free Mock LoginAlready registered? Login here

Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumsingle choice

Ice starts forming in a lake with water at $0^{\circ}$ C when the atmospheric temperature is $- 1 0^{\circ}$ C. If the time taken for 1 cm of ice to be formed is 7 hours, the time taken for the thickness of ice to change from 1 cm to 2 cm is:

Options:

Answer:

Solution:

$t \propto x^{2}$ . Time for 2 cm is $4 \times 7 = 28$ h. From 1 cm to 2 cm it takes $28 - 7 = 21$ h. D.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

Doubts & Discussion

Loading discussions...