The value of acceleration due to gravity g on the surface of Earth depends on MCQ with Answer and Explanation

Explanation:
Gamma emission is the release of high-energy electromagnetic radiation (photons) from a nucleus transitioning from an excited high-energy state to a lower, stable energy state. Gamma rays carry no mass and no electrical charge. Therefore, the emission of a gamma ray does not alter the number of protons (atomic number) or the total number of nucleons (mass number) of the atom.

Explanation:
Horizontal range R = u²sin(2θ)/g. sin(2θ) is maximum (value 1) when 2θ = 90° ⇒ θ = 45°. Thus maximum range at 45° projection angle, assuming same initial speed and level ground. Memory tip: 'Max range at 45°; max height at 90°'. This standard projectile motion result is frequently tested in competitive exams. Always verify assumptions: no air resistance, uniform gravity, launch and landing at same height. For different heights, optimal angle differs.

Explanation:
F = G×1×1/1² = 6.67×10⁻¹¹ N.