Convert the following into basic units:
a. `28.7 p m`
b. `15.15 p m`
c. `25365 mg`

Answer

A, B, C

Explanation

(i) 1 pm = `10^(-12)`m
Unit factor: `1=(10^(-12))/(1 "pm")`
28.7 pm `=28.7 "pm" xx (10^(-12)"pm")/(1 "pm") = 2.87 xx 10^(-11)` m
(ii) `1 mu s=10^(-6) s`
Unit factor : `1 = (10^(-6) s)/(1 mu s)`
`=1.515 xx 10^(-5)`s
(iii) `1 mg =10^(-6)` kg
Unit factor : `1 = (10^(-6) kg)/(1 mg)`
`therefore 25365 mg = 25365 mg xx (10^(-3)kg)/(1 mg)`
`=2.5365 xx 10^(-2)` kg