1
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The electron in hydrogen atom is initially in the third excited state. When it finally moves to ground state, the maximum number of spectral lines emitted are

A
3
B
4
C
5
D
6
2
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the electron in a hydrogen atom moves from ground state orbit to 5th orbit, then the potential energy of the electron

A
is increased
B
is zero
C
is decreased
D
remains unchanged
3
MHT CET 2020 16th October Morning Shift
MCQ (Single Correct Answer)
+1
-0

Using Bohr's quantisation condition, what is the rotational energy in the second orbit for a diatomic molecule? ($$I=$$ moment of inertia of diatomic molecule and, $$h=$$ Planck's constant)

A
$$\frac{h}{2 I \pi^2}$$
B
$$\frac{h^2}{2 I \pi^2}$$
C
$$\frac{h^2}{2 I^2 \pi^2}$$
D
$$\frac{h}{2 I^2 \pi}$$
4
MHT CET 2020 16th October Morning Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of speed of an electron in the ground state in the Bohr's first orbit of hydrogen atom to velocity of light $$(c)$$ is ( $$h=$$ Planck's constant, $$\varepsilon_0=$$ permittivity of free space, $$e=$$ charge on electron)

A
$$\frac{2 \theta^2 \varepsilon_0}{h c}$$
B
$$\frac{e^3}{2 \varepsilon_0 h c}$$
C
$$\frac{e^2}{2 \varepsilon_0 h c}$$
D
$$\frac{2 \varepsilon_0 h c}{e^2}$$
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