A refrigerator consumes an average 35W power to operate between temperature -10°C to 25°C. If there is no loss of energy then how much average heat per second does it transfer?

Option 1 - 350 J/s

Option 2 - 298 J/s

Option 3 - 35 J/s

Option 4 - 263 J/s

164 Views|Posted 6 months ago

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Answered by

Alok Kumar Singh | Contributor-Level 10

6 months ago

Correct Option - 4

Detailed Solution:

$\frac{Q_{H}}{Q_{L}} = \frac{T_{H}}{T_{L}}$

$\Rightarrow Q_{L} = \frac{T_{L}}{T_{H} - T_{L}} * (Q_{H} - Q_{L})$

$\Rightarrow \frac{d Q_{L}}{d t} = \frac{T_{L}}{T_{H} - T_{L}} . \frac{d (Q_{H} - Q_{L})}{d t}$

$= \frac{273 - 10}{25 - (- 10)} * 35$

$= 263 J s^{- 1}$

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physics ncert solutions class 11th 2023

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