The OCR indicates a mark next to option C (3/2), identifying it as the spin listed in the text for the 2 hyperon.

Geiger–Müller tubes typically use an inert gas like argon with a quenching vapor (often an alcohol) at reduced pressure, so both (A) and (C) apply.

Nuclear radius scales as A^(1/3); (32/4)^(1/3) = (8)^(1/3) = 2, so option C is correct.

Sodium-24 has a half-life of about 15 hours and has been used in medical tracer techniques to estimate blood volume.

The OCR shows a marker adjacent to option D ('Two'), indicating the text marks two varieties of K mesons.

Nuclear fusion processes commonly involve hydrogen isotopes (e.g., deuterium, tritium), so option A is correct.

Compton scattering demonstrates the particle (photon) nature of X-rays through momentum and energy exchange with electrons.

Activity decreases by factor 10 in 5 min, so λ = (1/5) ln(10) ≈ 0.4605 min^-1, matching 0.461 min^-1.

The block's answer hint indicates option A (~10-10 sec) as the half-life given in the OCR text for the particle denoted @2".

Alpha rays consist of positively charged helium nuclei, so they contain positively charged particles.