AP EAPCET 2025 - 22nd May Evening Shift | Atoms and Nuclei Question 13 | Physics

Each nuclear fission of ${ }^{235} \mathrm{U}$ releases 200 MeV of energy. If a reactor generates 1 MW power, then the rate of fission in the reactor is

$3.125 \times 10^6$

$3.125 \times 10^8$

$3.125 \times 10^{10}$

$3.125 \times 10^{16}$

AP EAPCET 2025 - 22nd May Morning Shift

MCQ (Single Correct Answer)

-0

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

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