The reverse of LED is______?
Correct answer: C. Photodiode
- A. Diode
- B. Resistor
- C. Photodiode
- D. Capacitor
Explanation
An LED is a p-n junction that emits light when forward biased, while a photodiode is designed to detect light and is commonly operated in reverse bias. The likely mistake is choosing an ordinary diode because an LED is a type of diode, but the reverse light-detection counterpart is specifically a photodiode.
Last updated
About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
Practise Electronics
660 free Electronics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
a certain transistor has collector current of 10 mA and a base current 40 uA. what is the current gain of the transistor
A light emitting diode (LED) emits light only when it isI. unbiasedII. reverse biasedIII. forward biased
A light emitting diode produces light when
A logic gate has four inputs. Its possible input combinations will be:
A n-type semiconductor is formed in an extrinsic semiconductor when