Question

How many `"nanometres"` in `7.5*mum`?

Answer 1

`7500` `nm`

Explanation:

`1` `mum` `=` `1xx10^-6m`

`1` `nm` `=` `1xx10^-9m`

`7.5*mum=7.50xx10^-6mxx10^9nm*m^-1` `=` `7500*nm`.