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## Homework Statement

A laser blackboard pointer delevers 0.10-mW average power in a beam 0.90 mm in diameter.

## Homework Equations

a) Find the average intensity.

b) Find the peak electric field.

c) Find the peak magnetic field.

## The Attempt at a Solution

ok for part a) i used the formula ave. s = p/4 pie r^2 (as p=.10 mW and r=0.45 mm)

but i didnt get the right answer

so am i using the wrong formula or the wrong value for r?

for part (b) and (c) i cant do anythin bout it cuz i need the average intensity

in order to find the elecric and magnetic fields.

somebody plez help me asap....thanx!!