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A laser beam has intensity 3.0xx10^14Wm^...

A laser beam has intensity `3.0xx10^14Wm^-2`. Find the amplitudes of electric and magnetic fields in the beam.

Text Solution

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Here, `I=3.0xx10^14Wm^-2`,
`E_0=?, B_0=?`
Intensity of the plane electromagnetic wave is
`I=u_(av)c=1/2in_0E_0^2c`
`:. E_0=sqrt((2I)/(in_0c))=sqrt((2xx3xx10^14)/((8.85xx10^-12)xx(3xx10^8))`
`=4.75xx10^8Vm^-1`
`B_0=(E_0)/c=(4.75xx10^8)/(3xx10^8)=1.58T`
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