MHT CET 2023 9th May Morning Shift | Atoms and Nuclei Question 26 | Physics

If an electron in a hydrogen atom jumps from an orbit of level $$n=3$$ to orbit of level $$n=2$$, then the emitted radiation frequency is (where R = Rydberg's constant, C = Velocity of light)

$$\frac{3 \mathrm{RC}}{27}$$

$$\frac{\mathrm{RC}}{25}$$

$$\frac{8 \mathrm{RC}}{9}$$

$$\frac{5 \mathrm{RC}}{36}$$

MHT CET 2022 11th August Evening Shift

MCQ (Single Correct Answer)

-0

Using Bohr's model, the orbital period of electron in hydrogen atom in the $$\mathrm{n}^{\text {th }}$$ orbit is $$\left(\varepsilon_0=\right.$$ permittivity of vacuum, $$\mathrm{h}=$$ Planck's constant, $$\mathrm{m}=$$ mass of electron, $$\mathrm{e}=$$ electronic charge)

$$\frac{4 \varepsilon_0 \mathrm{nh}^3}{\mathrm{me}^2}$$

$$\frac{4 \varepsilon_0 \mathrm{n}^2 \mathrm{~h}^2}{\mathrm{me}^2}$$

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

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

MHT CET 2022 11th August Evening Shift

MCQ (Single Correct Answer)

-0

The wave number of the last line of the Balmer series in hydrogen spectrum will be

(Rydberg's constant $$=10^7 \mathrm{~m}^{-1}$$ )

$$250 \mathrm{~m}^{-1}$$

$$2.5 \times 10^6 \mathrm{~m}^{-1}$$

$$0.25 \times 10^9 \mathrm{~m}^{-1}$$

$$2.5 \times 10^5 \mathrm{~m}^{-1}$$

MHT CET 2021 24th September Evening Shift

MCQ (Single Correct Answer)

-0

The half life of a radioactive substance is 30 minute. The time taken between 40% decay and 85% decay of the same radioactive substance is

15 minute

90 minute

60 minute

30 minute

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