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Course: Class 11 Physics (India) > Unit 15

Lesson 3: Modes of heat transfer
Science
Class 11 Physics (India)
Thermal properties of matter
Modes of heat transfer
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Thermal conduction (basic)

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Problem

Two thermos flasks made of the same material have thickness in the ratio 2:5 and surface areas in the ratio 3:5. Hot tea at the same temperature is poured into the two flasks.
What is the ratio of the time it takes to cool the tea to room temperature in the two flasks?
Note: Consider heat transfer only through conduction.
Choose 1 answer: