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Calculate the threshold freqency of th...

Calculate the threshold freqency of the metalfrom the photoelectronsare emitted with zero velocity when exposed to radiation of wavelength 6800 `Å`
Hint `: KE = (1)/(2) mv^(2)`
`hv= hv_(0) + KE, KE=0`
`v= (c ) /( lambda)`

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