A student records the initial length l, change in temperature ∆T and change in length ∆l of a rod as follows.
S.NO | l(m) | ∆T(°C) | ∆l(m) |
1. | 2 | 10 | 4×10-4 |
2. | 1 | 10 | 4×10-4 |
3. | 2 | 20 | 2×10-4 |
4. | 3 | 10 | 6×10-4 |
If the first observation is correct, what can you say about observations 2, 3 and 4?
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