Liquid helium has a very low boiling point 4.2K as well as low latent heat of vaporization, equal to 2.09 x 10⁴ J/kg. What is the boiling time for 2 kg of liquid helium by a 100W heater.

A 6.97 min

B 6.35 min

C 5.92 min

D 6.57 min

Solution

Correct Answer: Option A

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