QUESTIONS Judging from your experimental results, how valid is the assumption th

Question

QUESTIONS Judging from your experimental results, how valid is the assumption that the temperature measured by the ther- mometer is the temperature of the rod? y must you turn the micrometer screw back two full turns before heating the metal rod? any, would this have on your experimental results? Explain why this happens. 2. Wh 3. After repeated uses, the micrometer screw might cause an indentation in the end of the metal rod. What effect, if 4. If a mercury thermometer is immersed in a hot liquid, the mercury level goes down at first and then goes up. 5. A meterstick is used to measure the initial length of the rod. Why is it not used to measure its change in length Experiment 34 Coefficient of Linear Expansion 267

Explanation / Answer

1. if experimental results are close to 1 % of theoretical results than the result is said to match with the theorey
2. before heating the metal rod we must turn back the micrometer screw two whole turns to create sufficient gap between the rod and the screw to prevent hear to be transmitted to the micrometer screw by thermal contact, which would change its length and later compromise the micrometer screw readings

3. if there is an indentaion of the micrometer screw on the rod after many itrerations of the expoeriment , this will create a zero error in the diameter reading of the screw gauge

4. when mewrcury thermometer is immersed in hot water, its level goes down at first becaus eof expansion of the glass tube, then it rises up because of expansion of mercuty inside the glass tube

5. meter stick has a zero error of 0.1 cm which is the order of magnitude more than the observed change in length and hence it cannot be used to measure the length of the change of the rod ni tthe experiment

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