JEE Advanced 2020 Full Test 3 Paper 2

This section contains 02 paragraph each describing theory, experiment, data etc. Four questions relate to the paragraph. Each question of a paragraph has Only One correct answer among the four choices (A),(B),(C) and (D).

In a photoelectric effect, a point source of green light of power 40W emits mono-energetic photons that can just emit photoelectrons from an isolated metallic sphere of radius r=1cm, placed at a distance of 1m from the light source. Now, four other separate sources of violet, blue, red and yellow light emitting same number of photons as that of green light are brought near the source of green light.
Assume one photoelectron is emitted out of every 106 incident photons on sphere.
(Take λ‌violet ‌=4136Å,λ‌blue ‌=5000Å,λ‌red ‌=7200Å,λ‌green ‌=4963Å,hc=12408eVÅ)