MHT CET 2020 16th October Evening Shift | Atoms and Nuclei Question 49 | Physics

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)

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

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

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

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

MHT CET 2020 16th October Morning Shift

MCQ (Single Correct Answer)

-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)

$$\frac{2 \theta^2 \varepsilon_0}{h c}$$

$$\frac{e^3}{2 \varepsilon_0 h c}$$

$$\frac{e^2}{2 \varepsilon_0 h c}$$

$$\frac{2 \varepsilon_0 h c}{e^2}$$

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