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Question

A 5.00-mW laser pointer has a beam diameter of $2.00 \mathrm{~mm}$. a) What is the root-mean-square value of the electric field in this laser beam? b) Calculate the total electromagnetic energy in $1.00 \mathrm{~m}$ of this laser beam.

Solution

VerifiedAnswered 1 year ago

Answered 1 year ago

Step 1

1 of 8We will solve part $a)$ of the problem by using equation for intensity of the electromagnetic wave in terms of root-mean-square value of electric field in that electromagnetic wave. We will express and calculate rms value of electric field from that equation. We will solve part $b)$ of the problem by using equation for total electromagnetic energy of the wave.

The given values are:

$P=5 \mathrm{~mW}$

$d=2 \mathrm{~mm}$

$l=1 \mathrm{~m}$

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