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Question

Question: A laser beam of pulse power 10<sup>12</sup> watt is focused on an object area 10<sup>–4</sup> cm<sup...

A laser beam of pulse power 1012 watt is focused on an object area 10–4 cm2. The energy flux in watt/ cm2 at the point of focus is

A

(a) 1020

A

(b) 1016

A

(c) 108

A

(d) 104

Explanation

Solution

(b)

Sol. The energy flux φ=Pulse power Area =1012104=1016Wcm2\varphi = \frac{\text{Pulse power }}{\text{Area }} = \frac{10^{12}}{10^{- 4}} = 10^{16}\frac{W}{cm^{2}}