1.27 Convert the following into basic units:

(i) 28.7 pm

(ii) 15.15 pm

(iii) 25365 mg

(i)28.7pm:
1pm=10-12m
28.7pm=28.7×10-12m
=2.87×10-11m

(ii)15.15pm:
1pm=10-12m
15.15pm=15.15×10-12m
=1.515×10-12m

(iii)25365mg:
1mg=10-3g
25365mg=2.5365×104×10-3gSince,
1g=10-3kg
2.5365×101g=2.5365×10-1×10-3kg
25365mg=2.5365×10-2kg