Question

The micrometer is often called the micron. How many microns make up $$1.0km$$.

Answer 1

Hint: To solve this question we have to know what is micrometer and kilometer. Kilometer is the unit of length or distance or displacement. One kilometer is equal to one thousand meter. We also know that one kilometer is equal to $$0.621$$ miles. We know that, micron is a unit of length or distance which is equal to one millionth of a metre.

Complete step by step answer:
We also know that kilometres is also a unit of length which is equal to thousands of metres. Mile is longer than kilometre. Kilometre is smaller than miles. One kilometre is equal to one hundred hector metre. And we also know that one kilometre is equal to ten deka metre. We know that $$1.0km$$is equal to $${10}^3$$ m.And $$1\mu m={10}^{-6}m$$. So, we can write, number of microns in $$1.0km$$ is equal to $${\displaystyle \frac{{10}^3}{{10}^{-6}}}$$ which is equal to $${10}^9$$

So, from this calculation we can say, the number of microns in one kilometre is $${10}^9$$.

Note: We sometimes get confused between micron and micrometer. But we have to keep it in our mind that micrometers are microns. In some questions this will be not there to make you understand that micrometers are microns. We know that one micron or one micrometer is equal to $$0.001$$ millimetre. A micron is thousand times smaller than millimetre. One micron is equal to almost $$0.000039$$ inches. One micron is equal to $${10}^{-6}$$ metre. One inch is equal to $$25400$$ microns.