Conversion of Light to a Energy or Force

[mariosphysics]

I am looking to convert a light source (photons/cm^2/sec) to a energy or force. I have tried using Planck's but I'm not sure if this is in the right direction.

Any help greatly appreciated.

 

[tiny-tim]

welcome to pf!

hi mariosphysics! welcome to pf!

you'll need to know the wavelength

 

[mariosphysics]

ok i have a wavelength at 530 nm. I am trying to calculate the energy or force for a light flash (100ms). And a stimulus intensity such as 10^10.4 photon/cm^2/sec.

Is this possible? I do not know where to start. I was trying to convert to candela. But I could not find any equations to use.

 

[tiny-tim]

hi mariosphysics!

(just got up :zzz: …)

google "energy of a photon" for lots of cool sites

for example, http://www.pveducation.org/pvcdrom/properties-of-sunlight/energy-of-photon"

 

[mariosphysics]

Tiny-tim,

I understand how to calculate the energy of the light now. But how can I calculate it for the light flash or stimulus intensity such as 10^10.4 photon/cm^2/sec.

Or when I calculate energy of a photon (E) and then divide by the stimulus intensity to get: Joules/cm^2/sec. Does this make sense?

and then to get force I can multiply by the pathlength and time of light stimulus?

thanks for your help

 

[tiny-tim]

hi mariosphysics!

sorry, i don't see what you're getting at …

can you give a specific problem as an example, and say what's worrying you about it?