73. When rising humid air starts to condense, why does its tem- perature change

Question

73. When rising humid air starts to condense, why does its tem- perature change less rapidly with increasing elevation? (a) Its density increases, making it more difficult to change temperature. (b) Thermal energy released during condensation causes less thermal energy change. (c) The gas expands less, causing less negative work. (d) The temperature of the surrounding air is changing less. 74. After crossing a mountain top on a warm sunny day, what should cool dry air do? (a) Sink, because it is denser than warmer air below (b) Warm, because the surrounding gas does positive work in causing it to contract (c) Not change, as the surrounding air transfers little thermal energy by heating (Q 0) (d) a and bare correct. 75. Why does humid air rise in dry air? (a) Water is attracted to the clouds above. (b) A water molecule has lower mass than other air molecules. (c) 1 m3 of humid air has fewer molecules than 1 m3 of dry air at the same T and P. (d) b and c are correct. (e) None of the above is correct.

Explanation / Answer

73) thermal energy releaased during condensation causes less thermal energy change.
74) a nd b are correct.
75) b and c are correct

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