in an experimental set up to study the photoelectric effect a point soure fo light of power
Channel: Doubtnut
Date: 12/07/2020

in an experimental set up to study the photoelectric effect a point soure fo light of power `3.2xx10^(-3)` W was taken. The source can emit monoenergetic photons of energy 5eV and is located at a distance of 0.8 m from the centre of a stationary metallic sphere of work-function 3.0 eV. The radius of the sphere is `r = 8..10^(-3)` m. The efficiency  of photoelectric emission is one  for every `10^6` incident photons. Based on the information given above answer the questions given below. (Assume that the sphere is isolated and photoelectrons are instantly swepts away after the emission). de-Broglie wavelength of the fastest moving photoelectron is