Q. When the pressure on $1200\ ml$ of a gas in increased from $70\ cm$ to $120\ cm$ of mercury at constant temperature, the new volume of the gas will be
A) $700\ ml$
B) $600\ ml$
C) $500\ ml$
D) $400\ ml$
Explanation
(a) At constant temperature
$PV =$ constant
$\Rightarrow \frac{P_{1}}{P_{2}} = \frac{V_{2}}{V_{1}} \Rightarrow \frac{70}{120} = \frac{V_{2}}{1200} \Rightarrow V_{2} = 700\ ml$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.