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12.Kinetic Theory of Gases
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A gas filled in a cylinder. Its temperature is increased by $20\%$ on Kelvin scale and volume is reduced by $10\%$. How much percentage of the gas has to leak for pressure to remain constant ...... $\%$ ?
A
$30$
B
$40$
C
$15$
D
$25$
Solution
At $P=$ const. $\quad \Rightarrow V \propto \mathbf{M T}$
$\frac{\mathrm{V}_{1}}{\mathrm{V}_{2}}=\frac{\mathrm{M}_{1} \mathrm{T}_{1}}{\mathrm{M}_{2} \mathrm{T}_{2}} \Rightarrow \frac{100 \mathrm{V}}{90 \mathrm{V}}=\frac{100 \mathrm{M} \times 100 \mathrm{T}}{\mathrm{M}_{2} \times 120 \mathrm{T}} \Rightarrow \mathrm{M}_{2}=75 \mathrm{M}$
Leaked$\%$
$=\frac{\mathrm{M}_{1}-\mathrm{M}_{2}}{\mathrm{M}_{1}} \times 100 \%=\frac{100 \mathrm{M}-75 \mathrm{M}}{100 \mathrm{M}} \times 100=25 \%$
Standard 11
Physics
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