MHT CET 2020 19th October Evening Shift | Atoms and Nuclei Question 82 | Physics

Using Bohr's model, the orbital period of electron in hydrogen atom in $n$th orbit is ( $\varepsilon_0=$ permittivity of free space, $h=$ Planck's constant, $m=$ mass of electron and $\theta=$ electronic charge)

$\frac{2 \varepsilon_0^2 n^3 h^3}{m e^4}$

$\frac{8 \varepsilon_0^2 n^3 h^3}{m e^4}$

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

$\frac{4 \varepsilon_0^2 n^3 h^3}{m e^4}$

MHT CET 2020 16th October Evening Shift

MCQ (Single Correct Answer)

-0

A radioactive nucleus emits $$4 \alpha$$-particles and $$7 \beta$$-particles in succession. The ratio of number of neutrons of that of protons, is [$$A=$$ mass number, $$Z=$$ atomic number]

$$\frac{A-Z-13}{Z-2}$$

$$\frac{A-Z-15}{Z-1}$$

$$\frac{A-Z-13}{Z-1}$$

$$\frac{A-Z-11}{Z-2}$$

MHT CET 2020 16th October Evening Shift

MCQ (Single Correct Answer)

-0

The ratio of energies of photons produced due to transition of electron of hydrogen atom from its (i) second to first energy level and (ii) highest energy level to second level is respectively

$$2.5: 1$$

$$3: 1$$

$$2: 1$$

$$4: 1$$

MHT CET 2020 16th October Morning Shift

MCQ (Single Correct Answer)

-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)

$$\frac{h}{2 I \pi^2}$$

$$\frac{h^2}{2 I \pi^2}$$

$$\frac{h^2}{2 I^2 \pi^2}$$

$$\frac{h}{2 I^2 \pi}$$

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