In a nuclear reactor, heavy water is used as MCQ with Answer and Explanation

Explanation:
According to Einstein's photoelectric equation, the kinetic energy of emitted electrons depends exclusively on the frequency of the incident light and the metal's work function. Intensity represents the number of photons striking the surface per second. More photons mean more collisions with electrons, leading strictly to an increase in the number of emitted photoelectrons (photoelectric current), not their energy.

Explanation:
At night land cools quickly, high pressure over land, low over sea, wind from land to sea. Sea breeze opposite.

Explanation:
Ice displaces water equal to its weight; when melted, occupies exactly that volume. Level unchanged.