Question

Each of these questions contains two Statement : (Assertion) and Statement ll (Reason). Each  of these questions also has four alternative choices, only of which is correct answer.  You have to select the correct choice  in the codes (a),(b),(c) and (d) in the given below

(a) Statement I is true, Statement ll is true: Statement ll is not a correct explanation of Statement 

(b) Statement I is true, Statement ll is false

(c) Statement I is false, Statement ll is true

(d) Statement  is true, Statement ll is true;

Statement ll is a correct explanation of Statement I

Statement I If the half-life of a radioactive substance is 40 days, then 25% substance decays in 20 days.

Statement II      N = N₀(1/2)ⁿ

where, n = time elapsed/half-life Period

Answer 1

Correct Option (c) Statement I is false, Statement ll is true

Explanation: 

or   t/40 = 2

or   t = 80 days