Question : When K.Emax of photoelectrons is zero then the frequency of incident photon relative to threshold frequency is
(A). less
(B). equal
(C). greater
(D). small
Find the minimum amount of work needed to extract one calorie of heat from a body at temperature 0ºC when the temperature of the environment is 273ºC. (JNU M.Sc Entrance 2003)
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