A research laser delivers a single pulse of to a target

PHYSICS · Single correct · A Level · Physics · Nuclear physics · Nuclear physics

Problem

A research laser delivers a single pulse of 45 MJ45\,\text{MJ} to a target. What is the corresponding loss of mass of the laser system? (Take c=3.0×108 m s−1c = 3.0 \times 10^8\,\text{m\,s}^{-1}.) (a) 1.5×10−9 kg1.5\times10^{-9}\,\text{kg} (b) 4.5×10−10 kg4.5\times10^{-10}\,\text{kg} (c) 5.0×10−10 kg5.0\times10^{-10}\,\text{kg} (d) 5.0×10−9 kg5.0\times10^{-9}\,\text{kg}

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