Figure 1 shows a circuit containing a reverse-biased photodiode, three fixed resistors, a potential divider, and an ideal operational amplifier. This circuit is used to monitor the intensity of monochromatic radiation.
Figure 2 shows the calibration curve for this photodiode.
What is the configuration of the operational amplifier circuit shown in Figure 1? Select one from: comparator, differential amplifier, inverting amplifier, non-inverting amplifier.
Radiation of intensity 2.0 W m−22.0 \text{ W m}^{-2}2.0 W m−2 is incident on the photodiode. Show that the voltage at the non-inverting terminal (V+)(V_+)(V+) of the operational amplifier is approximately 4.1 V4.1 \text{ V}4.1 V.
The intensity of radiation incident on the photodiode remains at 2.0 W m−22.0 \text{ W m}^{-2}2.0 W m−2. Deduce whether the light-emitting diode (LED) in Figure 1 is on or off.