1.

Electrons are emitted from a metal surface on incidence of green colour of light. Among the following group of colours, which group will emit electrons?(a) Yellow blue, red(b) Violet, red yellow(c) Violet, blue, yellow(d) Violet, blue, sky blue

Answer»

(d) Violet, blue, sky blue
Work function ϕ = hv0 = \(\frac{h c}{\lambda_{0}}\)
⇒ ϕ ∝ \(\frac{1}{\lambda_{0}}\)
They will be emitted at low wavelength



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