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 1 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 2 English Option 1
B
KCET 2021 Physics - Atoms and Nuclei Question 2 English Option 2
C
KCET 2021 Physics - Atoms and Nuclei Question 2 English Option 3
D
KCET 2021 Physics - Atoms and Nuclei Question 2 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
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