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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class12  >>  Atoms
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A small potassium foil is placed (perpendicular to direction of incidence of light ) a distance r (=0.5 m) from a point light source whose output power $\;P_{0}\;$ is 1W . Assuming wave nature of light . how long would it take for foil to soak up enough energy (=1.8eV) from the beam to eject on electron ? (Assume that ejected photoelectron collected its energy from a circular area of foil whose radius equals radius of potassium atom ($\;1.3\times10^{-10}m$))

$(a)\;15s\qquad(b)\;17s\qquad(c)\;16s\qquad(d)\;18s$

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