imilar to Problem $19\mathrm{.}4-1.$

Quantum efficiency of an APD. A conventional APD with gain G operates at a wavelength $0=800$

$=30$

nm$.$ If its responsivity at this wavelength is R $,($a$)$ calculate its quantum efficiency $.($b$)$ What is

$=10$ A$/$W

the photocurrent at the output of the device if a photon flux $=1010$ photons$/$s $($at $0=800$ nm$)$ is incident on

it$?$