Photoelectric work function of a metal is 1eV. Light of

Photoelectric work function of a metal is 1eV. Light of wavelength λ = 3000 Å falls on it. The photo electrons come out with velocity

hv = W +	1	mv²
	2

or	hc	= W +	1
	λ		mv²

Here λ = 3000 Å = 3000 × 10^–10 m
and W = 1 eV = 1.6 × 10^–19 joule

∴	(6.6 × 10^-34)(3 × 10⁸)
	3000 × 10^-10

= (1.6 × 10^-19) +	1	× (9.1 × 10^-31)v²
	2

Solving we get,
v ≌ 10⁶ m/s