Light of wavelength 180 nm ejects photoelectrons from a plate of metal whose work - function is 2 eV. If a uniform magnetic field of `5xx10^(-5)` T be applied parllel to the palte, what would be the radius of the path followed by electrons ejected normally from the plate with maximum energy.

Answer

A, D

Explanation

`E = (12375)/(1800) = 6.875 eV`
`K_(max) or K = E_W`
= 4.875 eV
`r = (sqrt2Km)/(Bq)`
`=(sqrt 2xx4.875xx1.6xx10^(-19)xx9.1xx10^(-31)/(5xx10^(-5)xx1.6xx10^(-19))`
= 0.148 m.