Which of the following statement is not correct in the case of light emitting diodes?A. It is a heavily doped p-n junction.B. It emits light only when it is forward biased.C. It emits light only when it is reverse biased.D. The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used.Choose the correct answer from the options given below :C and DACB
Question
Which of the following statement is not correct in the case of light emitting diodes?A. It is a heavily doped p-n junction.B. It emits light only when it is forward biased.C. It emits light only when it is reverse biased.D. The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used.Choose the correct answer from the options given below :C and DACB
Solution
The correct answer is C and D.
Here's why:
A. It is a heavily doped p-n junction. - This statement is correct. Light Emitting Diodes (LEDs) are indeed heavily doped p-n junctions.
B. It emits light only when it is forward biased. - This statement is also correct. LEDs emit light when an electric current is applied in the forward direction of the device, i.e., it is forward biased.
C. It emits light only when it is reverse biased. - This statement is incorrect. LEDs do not emit light when they are reverse biased. In fact, applying a reverse bias can damage the LED.
D. The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used. - This statement is also incorrect. The energy of the light emitted by an LED is actually equal to the energy gap of the semiconductor, not less.
So, the correct answer is C and D.
Similar Questions
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