Special Purpose Diodes
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PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365445 An LED is constructed from a \(p\)-\(n\) junction based on a certain semiconducting material whose energy gap is 1.9\(eV\). Then the wavelength of the emitted light is

1 \(1.6 \times {10^{ - 8}}m\)
2 \(9.1 \times {10^{ - 5}}m\)
3 \(2.9 \times {10^{ - 9}}m\)
4 \(6.5 \times {10^{ - 7}}m\)
KCET - 2015
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365446 Read the Assertion and Reason carefully to mark the correct options given below:
Assertion :
Photo diodes are used in forward bias usually for measuring the light intensity.
Reason :
For a \(p-n\) junction diode, at applied voltage \(V\) the current in the forward bias is more than the current in the reverse bias for \(\left|V_{Z}\right|> \pm V \geq\left|V_{0}\right|\) where \(V_{0}\) and \(V_{Z}\) are the threshold voltage and the breakdown voltage.

1 Assertion is correct but Reason is incorrect.
2 Assertion is incorrect but reason is correct.
3 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
4 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
JEE - 2023
NEET DIGITAL LIBRARY
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365445 An LED is constructed from a \(p\)-\(n\) junction based on a certain semiconducting material whose energy gap is 1.9\(eV\). Then the wavelength of the emitted light is

1 \(1.6 \times {10^{ - 8}}m\)
2 \(9.1 \times {10^{ - 5}}m\)
3 \(2.9 \times {10^{ - 9}}m\)
4 \(6.5 \times {10^{ - 7}}m\)
KCET - 2015
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365446 Read the Assertion and Reason carefully to mark the correct options given below:
Assertion :
Photo diodes are used in forward bias usually for measuring the light intensity.
Reason :
For a \(p-n\) junction diode, at applied voltage \(V\) the current in the forward bias is more than the current in the reverse bias for \(\left|V_{Z}\right|> \pm V \geq\left|V_{0}\right|\) where \(V_{0}\) and \(V_{Z}\) are the threshold voltage and the breakdown voltage.

1 Assertion is correct but Reason is incorrect.
2 Assertion is incorrect but reason is correct.
3 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
4 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
JEE - 2023
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