When photons of energy hν fall on an aluminium plate (of

When photons of energy hν fall on an aluminium plate (of work function E₀), photo electrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photo electrons will be

Applying Einstein's formula for photo-electricity

hv = φ +	1	mv² ;
	2

hv = φ + K
φ = hv - K
If we use 2ν frequency then let the kinetic energy becomes K'
So,h . 2ν = φ + K'
2hν = hν – K + K'
K' = hν + K