Given below are two statements: 

Assertion (A):	In \(\alpha \text-\text{decay}\) atomic number of the daughter nucleus is reduced by \(2\) units from the parent nucleus.
Reason (R):	An \(\alpha \text-\text{particle}\) carries four units of mass.

 

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

At some instant, the number of radioactive atoms in a sample is \(N_0\) and after time '\(t\)',  the number decreases to \(N\). It is found that the graphical representation '\(ln N\)' versus '\(t\)' along the y and x axis respectively is a straight line. Then the slope of this line is:
1.  \(\lambda\)
2.  \(-\lambda\)
3.  \(\lambda^{-1}\)
4.  \(-\lambda^{-1}\)

The fraction of the original number of radioactive atoms that disintegrates (decays) during the average lifetime of a radioactive substance will be:
1.  \(\frac{1}{e}\)
2.  \(\frac{1}{1+e}\)
3.  \(\frac{e-1}{e+1}\)
4.  \(\frac{e-1}{e}\)