An argon ion laser puts 5 W of continuous power at a wavelength of 532 nm. the diameter of the laser beam is 5.5 nm. if the laser is pointed at an object, how many photons of laser will strike the object per second.|(1W=1Js-1).
To calculate the number of photons of laser that will strike the object per second, we need to use the formula:
Number of photons = Power / Energy per photon
First, let's calculate the energy per photon using the formula:
Energy per photon = Planck's constant * Speed of light / wavelength
Planck's constant, denoted as h, is approximately 6.63 x 10^-34 J·s, and the speed of light, denoted as c, is approximately 3 x 10^8 m/s.
Plugging in the values, we have:
Energy per photon = (6.63 x 10^-34 J·s) * (3 x 10^8 m/s) / (532 x 10^-9 m)
Now, we can calculate the energy per photon.
Energy per photon = 3.95 x 10^-19 J
Next, we can calculate the number of photons that will strike the object per second using the given continuous power of 5 W.
Number of photons = 5 W / (3.95 x 10^-19 J)
Now, let's calculate the number of photons.
Number of photons = 1.27 x 10^19 photons
Therefore, approximately 1.27 x 10^19 photons of laser will strike the object per second.