An argon laser emits light of wavelength 488 nm at power of 100 mW (milliwatt). Calculate the energy of the photons that are emitted. If one focus the light onto a surface using a microscope objective to a circle with diameter 5 μm (micrometer), what is the power density of the light at unit W/m2 . Calculate the number of photons emitted by the laser in ten seconds. What is the photon flux of the focused beam in 1 Å2 , roughly the area of one atom, in unit photon/s/Å2 I got 245x10^17 photons/second
Having trouble with the rest!

a

b

c

  tex]k =  2.45 *10^{19} \ photon /  second[/tex]

Explanation:

From the question we are told that

   The wavelength is  

   The  power is  

    The diameter of the circle is  

     The time taken is  

Generally the energy of the photon is mathematically represented as

substituting    for h , for  c  

So    

=>    

Generally the number of photons emitted  is mathematically

Generally the number of photons emitted in  by the laser in ten seconds is mathematically

=>    

=>    

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.