a
5.0 × 10\(^{-3}\) s\(^{-1}\)
b
5.1 × 10\(^{-3}\) s\(^{-1}\)
c
4.9 × 10\(^{-3}\) s\(^{-1}\)
d
5.2 × 10\(^{-3}\) s\(^{-1}\)
Explanation
Correct Option
aVideo Explanation
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PerfectEmerole
4 months ago
t¹/² = 0.693/decay constant
therefore: ( cross multiply to make decay constant the subject of the formula)
Decay constant = 0.693/ t¹/²
DC = 0.693/ 138.5 = 0.0050s-¹
converting to standard form = 5×10-³s-¹ option A.
