Physics

Problem

A pulsed laser emits light pulses, each of energy

5.0\,\text{kJ}

and duration

10\,\text{ns}

. During a materials-processing run the laser fires

1.0\times10^{6}

identical pulses. Use

c = 3.0\times10^8\,\text{m\,s}^{-1}

and

1\,\text{u} = 1.66\times10^{-27}\,\text{kg}

. a. (i) Calculate the total energy delivered by all the pulses. b. (ii) Compute the corresponding mass decrease in the laser medium, expressing your answer: (a) in kilograms, and (b) in atomic mass units (u).

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