\(1\,cm ^3\) ધનફળ ધરાવતો એક પરપોટો \(40\,m\) ઊંચાઈ ધરાવતા તળાવના તળિયેથી \(12^{\circ}\,C\) તાપમાનવાળી સપાટી તરફ જાય છે. અહી વાતાવરણનું દબાણ \(1 \times 10^5\,Pa\) અને પાણીની ધનતા \(1000\,kg / m ^3\) તથા \(g =10\,m / s ^2\) છે. \(40\,m\) ઊંડાઈએ પાણી અને તેની ઉપરની સપાટી વચ્યે તાપમાનનો કઈ તફાવત નથી. જ્યારે હવાનો પરપોટો સપાટી તરફ પહોંચશે ત્યારે તેનું ધનફળ \(..........\,cm^3\) હશે.

A \(5\mathrm{~cm}^3\)
B \(2\mathrm{~cm}^3\)
C \(4\mathrm{~cm}^3\)
D \(3\mathrm{~cm}^3\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(5\mathrm{~cm}^3\)

Step-by-step Solution

Detailed explanation

\(P = P _0+\rho gh =10^5\,Pa +10^3 \times 10 \times 40=5 \times 10^5\,Pa\) At \(T\) is constant \(PV = P _0 V _0\) \(\Rightarrow 5 \times 10^5\,Pa \times 1\,cm ^3=10^5 Pa \times V _0 \Rightarrow V _0=5\,cm ^3\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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