1
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The half life period of radioactive element x is same as the mean life time of another radioactive element y. Initially they have the same number of atoms. Then :
A
x-will decay faster than y.
B
y-will decay faster than x.
C
x and y have same decay rate initially and later on different decay rate.
D
x and y decay at the same rate always.
2
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
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 versus time is :

(Assume that at t = 0, there are no B atoms in the sample)
A
JEE Main 2021 (Online) 31st August Morning Shift Physics - Atoms and Nuclei Question 106 English Option 1
B
JEE Main 2021 (Online) 31st August Morning Shift Physics - Atoms and Nuclei Question 106 English Option 2
C
JEE Main 2021 (Online) 31st August Morning Shift Physics - Atoms and Nuclei Question 106 English Option 3
D
JEE Main 2021 (Online) 31st August Morning Shift Physics - Atoms and Nuclei Question 106 English Option 4
3
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
There are 1010 radioactive nuclei in a given radioactive element, its half-life time is 1 minute. How many nuclei will remain after 30 seconds? $$\left( {\sqrt 2 = 1.414} \right)$$
A
2 $$\times$$ 1010
B
7 $$\times$$ 109
C
105
D
4 $$\times$$ 1010
4
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
At time t = 0, a material is composed of two radioactive atoms A and B, where NA(0) = 2NB(0). The decay constant of both kind of radioactive atoms is $$\lambda$$. However, A disintegrates to B and B disintegrates to C. Which of the following figures represents the evolution of NB(t) / NB(0) with respect to time t?

[NA (0) = No. of A atoms at t = 0

NB (0) = No. of B atoms at t = 0]
A
JEE Main 2021 (Online) 26th August Evening Shift Physics - Atoms and Nuclei Question 109 English Option 1
B
JEE Main 2021 (Online) 26th August Evening Shift Physics - Atoms and Nuclei Question 109 English Option 2
C
JEE Main 2021 (Online) 26th August Evening Shift Physics - Atoms and Nuclei Question 109 English Option 3
D
JEE Main 2021 (Online) 26th August Evening Shift Physics - Atoms and Nuclei Question 109 English Option 4
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