Thermal Properties of Matter - Result Question 15

15. 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 :

[2016]

[Latent heat of ice is 3.4×105J/kg and g=10N/ kg]

(a) 34km

(b) 544km

(c) 136km

(d) 68km

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Answer:

Correct Answer: 15. (c)

Solution:

  1. (c) According to question only one-quarter of the heat produced by falling piece of ice is absorbed in the melting of ice.

i.e., mgh4=mL

h=4Lg=4×3.4×10510=136km.



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