STUDY GUIDE 18, SELF TEST 2

© Department of Physics, University of Guelph.

Select the problem number or part you wish.

Two different hot objects, A and B, both at 100ºC, are placed in a room at 20ºC. After 20.0 minutes, A has cooled down to 70.0ºC and B to 80.0ºC.

(a) Which one has the greater decay constant?
(b) What is the ratio of the larger decay constant to the smaller?
(c) How long will it take A to cool down from 70.0º to 40.0º?
(d) How long to cool down from 40.0º to 20.0º?

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