1
KCET 2021
MCQ (Single Correct Answer)
+1
-0

The figure shows standing de-Broglie waves due to the revolution of electron in a certain orbit of hydrogen atom. Then, the expression for the orbit radius is (All notations have their usual meanings)

KCET 2021 Physics - Atoms and Nuclei Question 12 English

A
$$\frac{h^2 \varepsilon_0}{\pi m e^2}$$
B
$$\frac{4 h^2 \varepsilon_0}{\pi m e^2}$$
C
$$\frac{9 h^2 \varepsilon_0}{\pi m e^2}$$
D
$$\frac{16 h^2 \varepsilon_0}{\pi m e^2}$$
2
KCET 2021
MCQ (Single Correct Answer)
+1
-0

An electron in an excited state of $$\mathrm{Li}^{2+}$$ ion has angular momentum $$\frac{3 h}{2 \pi}$$. The de-Broglie wavelength of electron in this state is $$p \pi a_0$$ (where, $$a_0=$$ Bohr radius). The value of $$p$$ is

A
3
B
2
C
1
D
4
3
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Which graph in the following diagram correctly represents the potential energy of a pair of nucleons as a function of their separation?

A
KCET 2021 Physics - Atoms and Nuclei Question 13 English Option 1
B
KCET 2021 Physics - Atoms and Nuclei Question 13 English Option 2
C
KCET 2021 Physics - Atoms and Nuclei Question 13 English Option 3
D
KCET 2021 Physics - Atoms and Nuclei Question 13 English Option 4
4
KCET 2021
MCQ (Single Correct Answer)
+1
-0

In a nuclear reactor heavy nuclei is not used as moderators because

A
they will break up
B
elastic collision of neutrons with heavy nuclei will not slow them down
C
the net weight of the reactor would be unbearably high
D
substance with heavy nuclei do not occur in liquid or gaseous state at room temperature
KCET Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12