A metal surface is illuminated by a radi...

A metal surface is illuminated by a radiation of wavelength 4500 Å . The ejected photo - electron enters a constant magnetic field of 2 m T making an angle of `90^(@)` with the magnetic field . If it starts revolving in a circular path of radius 2 mm , the work function of metal is approximately .

`1.36 eV`

`1.69 eV`

`2.78 eV`

`2.23 eV `

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