![An optical pulse containing 6 × 106 photons is incident on a photodiode and 4.5 × 106 electron-hole pairs are created](https://www.gkseries.com/blog/wp-content/uploads/2023/10/An-optical-pulse-containing-6-×-106-photons-is-incident-on-a-photodiode-and-4.5-×-106-electron-hole-pairs-are-created.jpg)
Q. An optical pulse containing 6 × 106 photons is incident on a photodiode and 4.5 × 106 electron-hole pairs are created. The maximum possible quantum efficiency (in %) of the photodiode is
Ans: 75
Sol:
Number of incident photons ′N′=6×106
Number of electron-hole pairs generated
n=4.5×106
Quantum efficiency of photo-diode
![](https://www.gkseries.com/blog/wp-content/uploads/2023/10/Screenshot-1032.png)