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NTA Abhyas JEE Main2020PhysicsThermal Properties of MatterPractice

A heating curve has been plotted for a solid object as shown in the figure. If the mass of the object is 100 g , then latent heat of vapourisation for the material of the object is [Given, power supplied to the object is constant and equal to 1 kW ]

Options

  1. A1.5 × 10 6 J / k g
  2. B2.5 × 10 6 J / k g
  3. C3.5 × 10 6 J / k g
  4. D9.0 × 10 6 J / k g

Correct answer

D. 9.0 × 10 6 J / k g

Step-by-step solution

The total heat supplied to the block is ∫ 1600 2500 p d t = m L v 1000 × 2500 - 1600 = 0 . 1 L v L v = 9.0 × 10 6  J / k g

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