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NEET 2016
Exam
NEET
Year
2016
Subject
Physics
Chapter
Thermal Properties of Matter

NEET 2016 · Physics · Thermal Properties of Matter

A piece of ice falls from a height h so that it melts completely....

A piece of ice falls from a height hh 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 hh is:
(Latent heat of ice is 3.4×105J kg−13.4 \times {10}^{5}{\text{J kg}}^{- 1} and g=10N kg−1g = 10{\text{N kg}}^{- 1})

Options

  1. A34km\text{34}\text{km}
  2. B544km\text{544}\text{km}
  3. C136km\text{136}\text{km}
  4. D68km\text{68}\text{km}

Correct answer

C. 136km\text{136}\text{km}

Step-by-step solution

14mgh=mL\dfrac{1}{4}mgh = mL

h=4Lg=4×3.4×10510=13.6×104h = \dfrac{4L}{g} = \dfrac{4 \times 3.4 \times {10}^{5}}{10} = 13.6 \times {10}^{4}

=136×103m= 136 \times {10}^{3}m

=136km= 136km
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