1
JEE Main 2022 (Online) 26th June Evening Shift
+4
-1
Out of Syllabus

A radioactive nucleus can decay by two different processes. Half-life for the first process is 3.0 hours while it is 4.5 hours for the second process. The effective half-life of the nucleus will be:

A
3.75 hours
B
0.56 hours
C
0.26 hours
D
1.80 hours
2
JEE Main 2022 (Online) 26th June Morning Shift
+4
-1
Out of Syllabus

How many alpha and beta particles are emitted when Uranium 92U238 decays to lead 82Pb206 ?

A
3 alpha particles and 5 beta particles
B
6 alpha particles and 4 beta particles
C
4 alpha particles and 5 beta particles
D
8 alpha particles and 6 beta particles
3
JEE Main 2022 (Online) 25th June Evening Shift
+4
-1
Out of Syllabus

Which of the following figure represents the variation of $${l_n}\left( {{R \over {{R_0}}}} \right)$$ with $${l_n}A$$ (if R = radius of a nucleus and A = its mass number)

A
B
C
D
4
JEE Main 2022 (Online) 25th June Morning Shift
+4
-1

The ratio for the speed of the electron in the 3rd orbit of He+ to the speed of the electron in the 3rd orbit of hydrogen atom will be :

A
1 : 1
B
1 : 2
C
4 : 1
D
2 : 1
EXAM MAP
Medical
NEET