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NEET2016PhysicsThermal Properties of MatterActual

A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is: (Latent heat of ice is 3.4 × 10 5 J kg - 1 and g = 10 N kg - 1 )

Options

  1. A34 km
  2. B544 km
  3. C136 km
  4. D68 km

Correct answer

C. 136 km

Step-by-step solution

1 4 m g h = m L h = 4 L g = 4 × 3.4 × 10 5 10 = 13.6 × 10 4 = 136 × 10 3 m = 136 k m

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