A metallic plate of surface charge density + 2 ϵ 0 (in SI units) is irradiated with photons of wavelength 620 nm. The work function of metal is 1.5 eV. What maximum distance from the metal plate can

Question

A metallic plate of surface charge density + 2 ϵ 0 ​ (in SI units) is irradiated with photons of wavelength 620 nm. The work function of metal is 1.5 eV. What maximum distance from the metal plate can the ejected photoelectrons go before turning back? (Assume photoelectrons to be emitted perpendicular to the plate)?

TestHub · Accepted Answer

K ma x ​ = 620 1240 ​ − 1.5 = 0.5 eV Field outside a charged metal plate: E = ϵ 0 ​ σ ​ = 2 V/m Retarding force on the electron: e E e E d = K ma x ​ d = 2 0.5 ​ = 4 1 ​ m Option (C)

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JEE Advanced 2027 (Class 12)