Urea is a fertilizer that provides: MCQ with Answer and Explanation

Explanation:
Boyle's law: P₁V₁ = P₂V₂. Given P₁=1.0 atm, V₁=2.0 L, P₂=4.0 atm. V₂ = (1.0 × 2.0) / 4.0 = 0.5 L. Volume decreases as pressure increases, because gas is compressible. The product PV is constant for a fixed mass of gas at constant T. Scuba divers experience this; as they dive deeper, pressure increases, reducing air volume in lungs.

Explanation:
Carbon-14 dating is used to determine age of organic materials up to ~50,000 years based on its half-life of 5730 years. Cobalt-60 for cancer therapy, iodine-131 for thyroid, uranium-235 for nuclear fuel.

Explanation:
Artificial transmutation is the conversion of a chemical element or an isotope into another through a nuclear reaction induced by bombarding it with high-energy particles (like alpha particles, protons, or neutrons). This was first achieved by Rutherford in 1919 when he converted nitrogen into oxygen.