Question
What is evaporation? State the various factors which affect evaporation.
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Two bodies A and B of equal masses are kept at heights of h and 2h respectively. What will be the ratio of in their potential energies?
Which of the above two graphs (a) and (b) (Fig.) representing the human voice is likely to be the male voice? Give reason for your answer.

Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.