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Propagation of Waves

A laser beam ...

Question

A laser beam of pulse power $10^{12}$ watt is focussed on an object are $10^{- 4} {c m}^{2}$ . The energy flux in watt/ ${c m}^{2}$ at the point of focus is

A

10²⁰

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B

10¹⁶

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C

10⁸

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D

10⁴

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Solution

The correct option is B 10¹⁶
The energy flux $ϕ$ = $\frac{P u l s e p o w e r}{A r e a} = \frac{10^{12}}{10^{- 4}} = 10^{16} \frac{W}{{c m}^{2}}$

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