A small metal plate (work function φ) is kept at a distance d from

Question:

A small metal plate (work function $\varphi$ ) is kept at a distance $d$ from a singly-ionised, fixed ion. A monochromatic light beam is incident on the metal plate and photoelectrons are emitted. Find the maximum wavelength of the light beam, so that some of the photoelectrons may go round the ion along a circle.

Solution:

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