The Decay Constant,k,is Given for Each of the Beta Emitters

Multiple Choice

The decay constant,k,is given for each of the beta emitters below.Which one has the shortest half life?

A) .¹¹⁵In,4.29 × 10^-9 s^-1
B) .¹³¹I,9.94 × 10^-7 s^-1
C) .²¹⁷At,21.4 s^-1
D) .⁴²K,1.55 × 10^-5 s^-1