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Light with an energy flux 20 W//cm^2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 30 cm^2 . the total momentum delivered ( for complete absorption)during 30 minutes is

If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in minutes ) .............. (Take : log 2 = 0.30 , log 2.5 = 0.40)

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If in two identical containers, equal quantities of ice melts completely in 30 and 20 minutes respectively, then find the ratio of the thermal conductivities of the material of two containers.

50% of a reaction is completed in 20 minutes and 75% is completed in 30 minutes from the beginning.What is the order of reaction

75 % of first order reaction is complete in 30 minutes. What is the time required for 93.75 % of the reaction (in minutes) ?