COMEDK 2023 Morning Shift | Atoms and Nuclei Question 36 | Physics

The wavelength of the first line of Lyman series for $$\mathrm{H}$$ - atom is equal to that of the second line of Balmer series for a $$\mathrm{H}$$-like ion. The atomic number $$\mathrm{Z}$$ of $$\mathrm{H}$$-like ion is

COMEDK 2023 Morning Shift

MCQ (Single Correct Answer)

-0

The first emission of hydrogen atomic spectrum in Lyman series appears at a wavelength of

$$\frac{3 R}{4} \mathrm{~cm}^{-1}$$

$$\frac{4}{3 R} \mathrm{~cm}$$

$$\frac{7 R}{144} \mathrm{~cm}^{-1}$$

$$\frac{400}{9 R} \mathrm{~cm}$$

COMEDK 2023 Evening Shift

MCQ (Single Correct Answer)

-0

The mass number of two nuclei $$\mathrm{P}$$ and $$\mathrm{Q}$$ are 27 and 125 respectively. The ratio of their radii $$R_P: R_Q$$ is given by:

9 : 25

3 : 5

27 : 25

5 : 3

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