Dual Nature of Matter and Radiation: JEE Main 2021 Physics question

JEE Main 2021 · 25 Jul, Evening shift · Q59

JEE Main 202125 Jul, Evening shiftPhysicsHardDual Nature of Matter and Radiation146× since 2002

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 are of radius 30 cm. The value of B is ___________

\times

10^

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7 T. Given hc = 20

\times

10^

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26 J-m, mass of electron = 9

\times

10^

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31 kg

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