An argonion laser produces a cylindrical beam of light whose

An argon-ion laser produces a cylindrical beam of light whose average power is 0.996 W. How much energy is contained in a 2.69-m length of the beam? Number Units

Solution

Beam is 2.69 m .

Beam travels with the speed of light.

so this Beams is 2.69 / (3 x 10^8 ) s long.

= 8.967 x 10^-9 s long

energy = Power x time

= 0.996 x 8.967 x 10^-9 = 8.93 x 10^-9 J