A small metal plate (work-function Wo) is kept at a distance d from a singly ionised fixed ion. A monochromatic light beam is incident on the metal plate and photoelectric are emitted. The maximum wavelength of light so that the photo-electrons may go round the ions along a circle is

# A small metal plate (work-function Wo) is kept at a distance d from a singly ionised fixed ion. A monochromatic light beam is incident on the metal plate and photoelectric are emitted. The maximum wavelength of light so that the photo-electrons may go round the ions along a circle is

1. A

$\frac{8{\mathrm{\pi \epsilon }}_{0}{\mathrm{W}}_{0}\mathrm{d}+{\mathrm{e}}^{2}}{8{\mathrm{\pi hc\epsilon }}_{0}\mathrm{d}}$

2. B

$\frac{8{\mathrm{\pi hc\epsilon }}_{0}\mathrm{d}}{8{\mathrm{\pi \epsilon }}_{0}{\mathrm{W}}_{0}\mathrm{d}+{\mathrm{e}}^{2}}$

3. C

$\frac{2\left(\frac{\mathrm{hc}}{{\mathrm{W}}_{0}}-{\mathrm{e}}^{2}\right)}{\mathrm{n}}$

4. D

$\frac{8{\mathrm{\pi \epsilon }}_{0}\mathrm{d}}{{\mathrm{hceW}}_{0}}$

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