Calculate too:
Physical pendulum

Photometry



Irradiance


Ee
W/m2
Φe
W
Sr
m2
α
rad

1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"




variables:

Ee - irradiance, i.e. radiated power per unit of area of receiver surface (radiant flux surface density)
Φe - radiation (or absorption) power, radiant flux
Sr - area of surface of radiation detector
α - angle between direction of radiation propagation and normal to surface



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