Assertion: A P-N junction diode is used in re | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) photodiode is a special type of $P-N$ junction diode that is operated under reverse bias conditions.When light of energy $h
u > E_g$ is incident

Vedclass · Accepted Answer

Both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.

Vedclass · Answer

(A) photodiode is a special type of $P-N$ junction diode that is operated under reverse bias conditions.When light of energy $h
u > E_g$ is incident on the junction,electron-hole pairs are generated.In reverse bias,the electric field at the junction is strong,which sweeps the generated charge carriers across the junction,creating a photocurrent.The magnitude of this photocurrent is directly proportional to the intensity of the incident light.Even though the reverse saturation current is very small,it is highly sensitive to the intensity of incident light,making it an ideal device for light detection.Therefore,both the Assertion and the Reason are true,and the Reason correctly explains the Assertion.

Assertion: $A$ $P-N$ junction diode is used in reverse bias to detect the intensity of light.
Reason: In reverse bias condition,current is small but it is more sensitive to changes in intensity of incident light.

Similar Questions

$A$ $CCD$ camera is fabricated using a semiconducting material having a band gap of $3 \ eV$. The wavelength of light it can detect is nearly (in $nm$)

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $2480 \; nm$ is incident on it. The band gap in $eV$ for the semiconductor is

Assertion: $A$ $p-n$ junction with reverse bias can be used as a photo-diode to measure light intensity.
Reason: In a reverse bias condition,the current is small but is more sensitive to changes in incident light intensity.

An $LED$ is manufactured using zinc selenide; then it emits:

The energy gap of an $LED$ is $2.4 eV$. When the $LED$ is switched $ON$,the momentum of the emitted photons is

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion: $A$ $P-N$ junction diode is used in reverse bias to detect the intensity of light.Reason: In reverse bias condition,current is small but it is more sensitive to changes in intensity of incident light.