Consider a `20W` bulb emitting light of wavelength `5000Å` and shinning on a metal surface kept at a distance `2m`. Assume that the metal surface has work function of `2eV` and that each atom on the metal surface can be treated as a circular disk of radius `1.5Å`. (i) Estimate no. of photons emitted by the bulb per second. [Assume no other losses] (ii) Will there be photoelectric emission? (iii) How much time would be required by the atomic disk to receive energy equal to work function `2eV`? (iv) How many photons would atomic disk receive within time duration calculated in (iii) above? (v) Can you explain how photoelectric effect was observed instantaneously? [Hint : Time calculated in part (iii) is from classical consideration and you may further take the target of surface area say `1cm^(2)` and estimate what would happen?]A. The number of photons emitted by the bulb per second. [Assume no other losses] is `5xx10^(19)s^(-1)`B. There will be photoelectric emissionC. Time required by the atomic disk to receive energy equal to work function `(2eV)` is `11.4s`D. The number of photons would atomic disk receive within time duration calculated in `(iii)` above is `2`