Geochemists examining the granite in a mountain determine that the rock contains

Question

Geochemists examining the granite in a mountain determine that the rock contains "80% as much 235U today as it did when the rock first formed. If the decay cost an 235U is r 9.85 times 10^-10 year-1, how old is this granite? 157 million years 203 million years 227 million years 813 million years 1, 020 million years A refrigerator has coefficient of performance 4.0. If its compressor does 40.0 work during one cycle, how much heat does the refrigerator exhaust per cycle. 8.0 J 10. J 13. J 160 J 200 J

Explanation / Answer

Question 5 ) coefficient of performance( COD) is given by formula

COD = Qh /W

Given COD = 4 , W = 40 J

4 = Qh/40

Qh = 40*4 = 160 J

Therefore answer) option D) 160 J

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