Atuning fork vibrates 88 times in 0.20 s what is its frequency

In a system, when potential energy decreases, then entropy also decreases. true false

Give an example in which the electrical energy changes to light energy

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.