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A light beam of wavelength 500 nm is inc...

A light beam of wavelength 500 nm is incident on a metal having work function of 1.25 eV, placed in a magnetic field of intensity B. The electrons emitted perpendicular to the magnetic field B, with maximum kinetic energy are bent into circular arc of radius 30 cm. The value of B is `"______" xx 10^(-7) T.`
Given `hc = 20 xx 10^(-26)` J-m , mass of electron ` = 9 xx 10^(-31)` kg

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