Light from a laser forms a 1.31-mm diameter spot on a wall. if the light intensity in the spot is what is the power output of the laser?

0.04973 W

Explanation:

I = Intensity of laser = (assumed, as it is not given)

d = Diameter of spot = 1.31 mm

r = Radius =

A = Area =

Power is given by

The power output of the laser is 0.04973 W

close lines strong magnet less close weaker

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is