1
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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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
2
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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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
JEE Main 2022 (Online) 25th June Evening Shift Physics - Atoms and Nuclei Question 110 English Option 1
B
JEE Main 2022 (Online) 25th June Evening Shift Physics - Atoms and Nuclei Question 110 English Option 2
C
JEE Main 2022 (Online) 25th June Evening Shift Physics - Atoms and Nuclei Question 110 English Option 3
D
JEE Main 2022 (Online) 25th June Evening Shift Physics - Atoms and Nuclei Question 110 English Option 4
3
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
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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
4
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
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In Bohr's atomic model of hydrogen, let K, P and E are the kinetic energy, potential energy and total energy of the electron respectively. Choose the correct option when the electron undergoes transitions to a higher level :

A
All K, P and E increase.
B
K decreases, P and E increase.
C
P decreases, K and E increase.
D
K increases, P and E decrease.
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