The mass of a pi-meson (pion) is approximately how many times the mass of an electron?

The correct answer is Option D — 274 times. The mass of a pion (pi-meson) is approximately 274 times the mass of an electron. Since electron mass = 9.1 × 10⁻³¹ kg, pion mass ≈ 274 × 9.1 × 10⁻³¹ kg ≈ 2.5 × 10⁻²⁸ kg. Option A (50 times): Too low. The actual value is 274 times. Option B (100 times): Incorrect. The actual ratio is 274. Option C (200 times): Close but incorrect. The exact value is approximately 274.