تجــــــمع chemistry110

[just besh]

How number in nanoseconds which is equivalent to 2 minutes is ?
(a) 1.2 x 10-11
(b) 1.2 x 10-11
(c) 1.2 x 10-14
(d) 1.2 x 10 +8

ايوا هذا الصح ماشاء الله تبارك الله