A0.60 mw laser produces a beam of light with a diameter of 1.1 mm . part a what is the average intensity of this beam?
part b at what distance does a 130 w lightbulb have the same average intensity as that found for the laser beam in part (a)? (assume that 5.0% of the bulb's power is converted to light.)

The average intensity of this beam and the distance are 631.4 w/m² and 2.86 cm.

Explanation:

Given that,

Power = 0.60 mW

Diameter = 1.1 mm

(A). We need to calculate the average intensity of this beam

Using formula of intensity

Put the value into the formula

(B). We need to calculate the distance

Given that,

Power = 130 W

5% of 130 W is 6.5 w

Using formula of  intensity

Put the value into the formula

The distance is 2.86 cm.

Hence, The average intensity of this beam and the distance are 631.4 w/m² and 2.86 cm.