A beam of light is propagating through a block of glass with refractive index n. The block is moving with a constant speed v in the direction opposite to that of the beam. The speed of the light beam in the block as measured by an observer in the laboratory frame is:

Match List - I (Modern Physics Concept) with List - II (Associated Term): List - I (a) De Broglie Hypothesis (b) Compton Effect (c) Zeeman Effect (d) Pair Production List - II (1) γ → e− + e+ (2) Splitting of Spectral Lines (3) Matter Waves (4) Photon Scattering

The relationship between the decay constant (λ) and half-life (T1/2) of a radioactive substance is given by: