Complete Question
The complete question is shown on the first and second uploaded image
Answer:
The expression is
Explanation:
Generally smallest workdone done by a gas is mathematically represented as

Generally for an isothermal process

=> 
Generally the total workdone is mathematically represented as

=> 
=> ![nRT [lnV] | \left \ {V_f}} \atop {V_o}} \right.](https://tex.z-dn.net/?f=nRT%20%5BlnV%5D%20%20%20%7C%20%5Cleft%20%5C%20%7BV_f%7D%7D%20%5Catop%20%7BV_o%7D%7D%20%5Cright.)
=> ![W_c = nRT [ln(V_f) - ln(V_o)]](https://tex.z-dn.net/?f=W_c%20%3D%20nRT%20%5Bln%28V_f%29%20-%20ln%28V_o%29%5D)
=> 
From the question 
=> 
at initial state
If you could hear it at all, it would sound very soft.
Answer:
Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth.
Explanation: