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10-1.Thermometry, Thermal Expansion and Calorimetry
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If liquefied oxygen at $1$ atmospheric pressure is heated from $50\, K$ to $300\, K$ by supplying heat at constant rate. The graph of temperature vs time will be
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(AIIMS-2012)
Solution
$Q=m c \Delta T$
$\mathrm{Q}=\mathrm{mc}\left(\mathrm{T}-\mathrm{T}_{0}\right)\,\,\,\,\,\,\,…(i)$
$Q=$ Kt whereas $K$ is heating rate
from $50$ to boiling temperature, $\mathrm{T}$ increases linearly.
At vaporization, equation is $Q=m L$
so, temperature remains constant till vaporisation is complete
After that, again Eqn $(i)$ is followed and temperature increases linearly
Standard 11
Physics
Similar Questions
Values for latent heat in Column$-\,I$ and its values are given in Column$-\,II$. Match the followings :
| Column $-\,I$ | Column $-\,II$ |
| $(a)$ Latent heat of vaporization $L_V$ | $(i)$ $22.6\, \times \,{10^5}\,J\,/kg$ |
| $(b)$ Latent heat of fusion $L_f$ | $(ii)$ $33.3\, \times \,{10^5}\,J\,/kg$ |
| $(iii)$ $3.33\, \times \,{10^5}\,J\,/kg$ |
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