meka mCQ walta oni unu lesi kramayak.godak prayojanawath una mata.
wikiranashilathawa kiyana padama ganai.(physics wala anthima padama)
Arda ayukala t gananakata pasuwa ithiri wikiranashili anshu ganana= N
arambaka wikiranashili anshu ganana =n nam,
api iganagaththa N=n e^-λt kiyala ekak...