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Light of wavelength 4000 Å is incident ...

Light of wavelength `4000 Å` is incident on barium. The emitted photoelectrons describe a circle of radius 50 cm by a magnetic field of flux density `5.26 xx 10^(-6)T`. What is the work function of barium in eV? Given, `h = 6.6 xx 10^(-34)J.s, " " e = 1.6 xx 10^(-19)C, " " m_(e) = 9.1 xx 10^(-31) kg`

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2.5 eV (approx)
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