Question

9. A pendulum clock having copper rod keeps correct time at 20° C. It gains 15 second per day if
cooled to OC, the coefficient of linear expansion of copper is
(a) 1.7 x 10-7° C
(b) 1.7 x 10-6° C
(c) 3.4 x 10-4° C
(d) 3.4 x 10-6/° C
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Answer 1

Answer:

The answer is a option A

Answer 2

Answer:

the answer is option a

thanks