1
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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.
2
JEE Main 2022 (Online) 24th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Choose the correct option from the following options given below :

A
In the ground state of Rutherford's model electrons are in stable equilibrium. While in Thomson's model electrons always experience a net-force.
B
An atom has a nearly continuous mass distribution in a Rutherford's model but has a highly non-uniform mass distribution in Thomson's model.
C
A classical atom based on Rutherford's model is doomed to collapse.
D
The positively charged part of the atom possesses most of the mass in Rutherford's model but not in Thomson's model.
3
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
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 67 English Option 1
B
JEE Main 2021 (Online) 31st August Morning Shift Physics - Atoms and Nuclei Question 67 English Option 2
C
JEE Main 2021 (Online) 31st August Morning Shift Physics - Atoms and Nuclei Question 67 English Option 3
D
JEE Main 2021 (Online) 31st August Morning Shift Physics - Atoms and Nuclei Question 67 English Option 4
4
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
A moving proton and electron have the same de-Broglie wavelength. If K and P denote the K.E. and momentum respectively. Then choose the correct option :
A
Kp < Ke and Pp = Pe
B
Kp = Ke and Pp = Pe
C
Kp < Ke an Pp < Pe
D
Kp > Ke and Pp = Pe
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