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Jul29-11, 05:42 AM
P: 3,807
Hi Idesa149!!

Did you completely check your equations?
You can write
"hv=W+1/2v^2" as:-


Now you see, the threshold frequency(v0) depends on the frequency of incident light.

And as tiny-tim stated, threshold frequency is fixed for a particular metal. That is, if you incident a light with a lower frequency and that too with a large intensity, a single elctron wouldn't be emitted.