Convert into metre :
(i) 7 nm (diameter of small virus)
(ii) 41 pm (distance of nearest star)

Answer

A, B, D

Explanation

(i) `1 nm = 10^(-9)`m
Unit factor : 1 `=(10^(-9) m)/(1 nm)`
`therefore 7 nm = 7 nm xx (10^(-3) m)/(1 nm = 7 xx 10^(-9)`m
(ii) 1 pm `=10^(-12)`m
`1 = (10^(-2) m)/(1 "pm")`
`therefore 41 "pm" = 41 "pm" xx (10^(-12) m)/(1 "pm") = 41 xx 10^(-12)`m