KCET 2021 | Atoms and Nuclei Question 13 | Physics

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

$$\frac{h^2 \varepsilon_0}{\pi m e^2}$$

$$\frac{4 h^2 \varepsilon_0}{\pi m e^2}$$

$$\frac{9 h^2 \varepsilon_0}{\pi m e^2}$$

$$\frac{16 h^2 \varepsilon_0}{\pi m e^2}$$

KCET 2021

MCQ (Single Correct Answer)

-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

KCET 2021

MCQ (Single Correct Answer)

-0

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

KCET 2021 Physics - Atoms and Nuclei Question 2 English Option 1

KCET 2021 Physics - Atoms and Nuclei Question 2 English Option 2

KCET 2021

MCQ (Single Correct Answer)

-0

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

they will break up

elastic collision of neutrons with heavy nuclei will not slow them down

the net weight of the reactor would be unbearably high

substance with heavy nuclei do not occur in liquid or gaseous state at room temperature

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