GENERAL KNOWLEDGE

GK

NUCLEAR SCIENCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Time taken by a radioactive substance to decay half is called
A
half life
B
time delay
C
half period
D
time constant
Explanation: 

Detailed explanation-1: -A half-life is the amount of time that it takes for a radioactive substance to decay one-half of its original quantity.

Detailed explanation-2: -Half-Life is normally defined as the time needed by a radioactive substance (or one half the atoms) to disintegrate or transform into a different substance. The principle was first discovered in 1907 by Ernest Rutherford. It is usually represented by the symbol Ug or t1/2.

Detailed explanation-3: -The rate of decay, or activity, of a sample of a radioactive substance is the rate of decrease in the number of radioactive nuclei per unit time. The half-life of a reaction is the time required for the reactant concentration to decrease to one-half its initial value.

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