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NCERT Physics Class 12 Exemplar Ch 14 Semiconductor Electronics Materials Devices and Simple Circuits Part 2
Short Answer
23
(i) Name the type of a diode whose characteristics are shown in Fig. (A) and Fig. (B) .
(ii) What does the point P in Fig (A) Represent?
(iii) What does the points P and Q in Fig (B) Represent?
Ans:
- ZENER junction diode and solar cell.
- Zener breakdown voltage
- Q- short circuit current
- P- Open circuit voltage.
24 Three photo diodes and are made of semiconductors having band gaps of and , respectively. Which ones will be able to detect light of wavelength ?
Ans:
- Energy of incident light photon
- For the incident radiation to be detected by the photodiode, energy of incident radiation photon should be greater than the band gap.
- This is true only for D2. Therefore, only D2 will detect this radiation.
25 If the resistance is increased (Fig.) , how will the readings of the ammeter and voltmeter change?
Ans:
If is increased, IB will decrease. Since it will result in decrease in i.e. decrease in ammeter and voltmeter readings.