If a gas expands from $20 \ cm^3$ to $50 \ cm^3$ at a constant temperature $(T)$ under a pressure of $1 \ atm$,what will be the final pressure?
- A$20 \times \frac{1}{50} \ atm$
- B$50 \times \frac{1}{200} \ atm$
- C$1 \times \frac{1}{20} \times 50 \ atm$
- DNone of these
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