MHT CET 2023 13th May Evening Shift | Atoms and Nuclei Question 38 | Physics

An excited hydrogen atom emits a photon of wavelength $$\lambda$$ in returning to ground state. The quantum number $$n$$ of the excited state is ($$R=$$ Rydberg's constant)

$$\sqrt{\lambda R(\lambda R-1)}$$

$$\sqrt{\frac{\lambda R}{(\lambda R-1)}}$$

$$\sqrt{\frac{(\lambda R-1)}{\lambda R}}$$

$$\sqrt{\frac{1}{\lambda R(\lambda R-1)}}$$

MHT CET 2023 13th May Evening Shift

MCQ (Single Correct Answer)

-0

When an electron is excited from its 4 th orbit to 5 th stationary orbit, the change in the angular momentum of electron is approximately.

(Planck's constant $$=h=6.63 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$ )

$$2 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$

$$6.63 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$

$$1 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$

$$3.14 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$

MHT CET 2023 13th May Morning Shift

MCQ (Single Correct Answer)

-0

A radioactive sample has half-life of 5 years. The percentage of fraction decayed in 10 years will be

25%

50%

75%

100%

MHT CET 2023 13th May Morning Shift

MCQ (Single Correct Answer)

-0

An isotope of the original nucleus can be formed in a radioactive decay, with the emission of following particles.

one $$\alpha$$ and one $$\beta$$

one $$\alpha$$ and two $$\beta$$

one $$\alpha$$ and four $$\beta$$

four $$\alpha$$ and one $$\beta$$

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