COMEDK 2025 Evening Shift | Atoms and Nuclei Question 15 | Physics

When ${ }^{10} \mathrm{~B}_5$ nuclei are bombarded by neutrons, one of the resultant nuclei is ${ }^7 \mathrm{Li}_3$. Then the emitted particle will be:

Alpha particle

Neutrons

Gamma particle

Beta particle

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

What is the frequency ' $\nu$ ' of the electron in Bohr's first orbit of radius ' $r$ ' of the hydrogen atom?

$v=\frac{e^2}{4 \pi \varepsilon_0 h r}$

$v=\frac{e^2}{2 \pi \varepsilon_0 h r^2}$

$v=\frac{e^2}{4 \pi \varepsilon_0 h r^2}$

$v=\frac{e^2}{2 \pi \varepsilon_0 h r}$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

To get 300 MW electric power for half an hour, how much mass is to be completely converted into energy?

$6 \times 10^{-2} \mathrm{~kg}$

$3 \times 10^{-6} \mathrm{~kg}$

$6 \times 10^{-3} \mathrm{~kg}$

$6 \times 10^{-6} \mathrm{~kg}$

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