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NEET UG PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER

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In a photocell bichromatic light of wavelength 2475A∘2475\mathop A\limits^ \circ and 6000  A∘6000\;\mathop A\limits^ \circ are incident on cathode whose work function is 4.8  eV.4.8\;eV. If a uniform magnetic field of 3×10−5tesla3 \times {10^{ - 5}}tesla exists parallel to the plate, the radius of the path described by the photoelectron will be (mass of electron =9×10−31kg= 9 \times {10^{ - 31}}kg)
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Correct option: B
5  cm5\;cm
Option B (5  cm5\;cm) is correct because it is the radius of the path described by the photoelectron, calculated using the maximum kinetic energy and the magnetic field.

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