Q14 of 27 Page 80

A student records the initial length l, change in temperature ∆T and change in length ∆l of a rod as follows:


If the first observation is correct, what can you say about observations 2, 3 and 4.


As we know, so from 1st observation we can say that linear expansion of this rod will be

. Now this linear expansion will be same for all observations. Now we will check for rest of observations, so for 2nd observation


but in question


which is not equal to our calculated value hence this observation is wrong.


Similarly for 3rd observation


but given hence this observation is also wrong. Now last observation


which is correct.


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