AP EAPCET 2025 - 22nd May Morning Shift | Atoms and Nuclei Question 14 | Physics

The difference between the frequencies of second and first Paschen lines of hydrogen atom is ( $R=$ Rydberg constant and $c=$ speed of light in vacuum)

$\frac{9 R c}{16}$

$\frac{16 R c}{25}$

$\frac{9 R c}{400}$

$\frac{3 R c}{200}$

AP EAPCET 2025 - 22nd May Morning Shift

MCQ (Single Correct Answer)

-0

If the time taken for a radioactive substance to decay $8 \%$ to $77 \%$ is 12 minutes, then the half life of the substance in minutes is

AP EAPCET 2025 - 21st May Evening Shift

MCQ (Single Correct Answer)

-0

For an observer on the Earth, if a spectral line of wavelength $6600\mathop {\rm{A}}\limits^{\rm{o}}$ emitted by a star is found to be red shifted by $22 \mathop {\rm{A}}\limits^{\rm{o}}$, then the star is

receding away from Earth with a speed of $9 \times 10^5 \mathrm{~ms}^{-1}$

receding away from Earth with a speed of $10 \times 10^5 \mathrm{~ms}^{-1}$

moving towards Earth with a speed of $9 \times 10^5 \mathrm{~ms}^{-1}$

moving towards Earth with a speed of $10 \times 10^5 \mathrm{~ms}^{-1}$

AP EAPCET 2025 - 21st May Evening Shift

MCQ (Single Correct Answer)

-0

The difference between the frequencies of the first and second Lyman lines of hydrogen atom is ( $R=$ Rydberg constant and $c=$ speed of light in vacuum)

$\frac{9 R c}{28}$

$\frac{7 R c}{12}$

$\frac{3 R c}{8}$

$\frac{5 R c}{36}$

PREVIOUS NEXT

AP EAPCET Subjects

Browse all chapters by subject