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Anna71 [15]
4 years ago
5

A helium–neon laser emits a beam of circular cross section with a radius r and a power P.?. (a) Find the maximum electric field

in the beam. (Use any variable or symbol stated above along with the following as necessary: μ0 and c.. (b) What total energy is contained in a length of the beam? (Use the following as necessary: P,l , and c.)(c) Find the momentum carried by a length of the beam. (Use the following as necessary: P, l, and c.)
Physics
1 answer:
olchik [2.2K]4 years ago
5 0

there is a relation between intensity of light beam and the magnitude of electric field.<span>I=(1/2)c<span>ϵo</span>n<span>E2</span>=P/π<span>r2</span></span> <span><span>E2</span>=2P/c<span>ϵo</span>nπ<span>r2</span></span> E= magnitude of electric field n= refractive index of medium <span><span>μo</span><span>ϵ0</span>=1/<span>c2
</span></span>energy= power*time = P*(1m/speed of light)<span><span>energy=(P∗1m)/c</span></span>
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