The radiant energy from a red giant star is produced by:

Which of the following statement$(s)$ is/are correct?

Which of the following statements is correct?

$1 \, g$ of hydrogen is converted into $0.993 \, g$ of helium in a thermonuclear reaction. The energy released is

The minimum frequency of a photon required to break a particle of mass $15.348 \ amu$ into $4 \ \alpha$ particles is . . . . . . $kHz$.
[Mass of $He$ nucleus = $4.002 \ amu$,$1 \ amu = 1.66 \times 10^{-27} \ kg$,$h = 6.6 \times 10^{-34} \ J \cdot s$ and $c = 3 \times 10^8 \ m/s$]

In a nuclear reactor,the function of the moderator is to decrease