JEE Main 2021 · PhysicsMultiple choiceDiagram basedMediumData or graph
JEE Main 31 August 2021, Shift 1, Physics Q3
Question 3 of 90 in this shift, Physics question 3 of 30, Section A.
A sample of a radioactive nucleus A disintegrates to another radioactive nucleus B, which in turn disintegrates to some other stable nucleus C. Plot of a graph showing the variation of number of atoms of nucleus B vesus time is :
(Assume that at t = 0, there are no B atoms in the sample)
The figure, in words
Four graphs of No. of atoms (vertical axis) against time (horizontal axis); each option is one graph.- (1)[figure: graph of No. of atoms vs time, curve falling steeply from a high value and flattening towards the time axis]
- (2)[figure: graph of No. of atoms vs time, curve starting at the origin, rising to a smooth maximum and then falling to a low value]Official answer
- (3)[figure: graph of No. of atoms vs time, straight line rising from the origin to a sharp peak, then a decaying curve falling towards the time axis]
- (4)[figure: graph of No. of atoms vs time, straight line rising from the origin and then a horizontal line at constant value]
Official answer
Option 2
NTA final key.
- Chapter
- Nuclei
- Topic
- Radioactive Decay
- Idea tested
- Successive Decay Chains