In a photoelectric setup , apoint source of light of power 3.2*10^-3 W emits monoenergetic photons of energy 5.0eV . The source is located at a distance of 0.8 m from the centre of a stationary metallic sphere of work function 3.0eV and of radius 8*106-3 m. The efficiency of photoelectron emission is one for every 1066 incident photons. Assume that the sphere is isolated and initially neutral and that photoelectrons are instantly sewpt away after emission.a)Calculate the number of photoelectrons emitted per secondb)find ration of wavelength of incident light to the de brogile wavelength of the fastest photoelectron(ans- a)10^5 /s ,b)286.1/1

Hrishant Goswami , 11 Years ago

Grade 10