Answer:
We
know that, one light year = speed of light x time (one year)
\[=\left( \text{3}.00\times \text{1}{{0}^{\text{8}}} \right)\times \left(
\text{3}\text{.154}\times \text{1}{{0}^{\text{7}}}
\right)=\text{9}\text{.462}\times \text{1}{{0}^{\text{15}}}\text{ m}\]
As
per rule, when two physical quantities are multiplied, the number of
significant figures in the result cannot be greater than the least number of
significant figures in any of the two quantities. We do not agree with the
student. The product is, therefore, rounded off to contain three significant
figures. We may write: one light year =\[\text{9}\text{.46}\times
\text{1}{{0}^{\text{15 }}}\text{m}\].
You need to login to perform this action.
You will be redirected in
3 sec