Re: [Phys-L] [**External**] Photoelectric effect: electron current vs. frequency2

[Brian Whatcott <betwys1@sbcglobal.net>]

   - Nov 10, 21 Antti Savinainen wrote:   
   
> Hi,  /snip/, the Khan Academy   
>     
>  https://www.khanacademy.org/science/physics/quantum-physics/photons/a/photoelectric-effect)   
>   
> explains it thusly:   
>   
> "Because the light amplitude was kept constant as the light frequency   
> increased, the/number/of photons being absorbed by the metal remained the same.   

   - /snip/
Try this on:If the light beam amplitude is kept constant, its intensity hence energy density is kept constant. If each photon carries higher energy at higher frequencies, then to hold the beam energy density constant, fewer photons of higher energy are needed. If fewer photons impact a photo-emitter, then fewer electrons are emitted.Hence not only is Khan mistaken, but Einstein too!  <g>Brian