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Q.

The I - V characterisic of an LED is 
 

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a

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b

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c

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d

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answer is D.

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Detailed Solution

  • LEDs constantly operate under the condition of forward biassing, and when powered up, they produce light.
  • Light energy is created at the junction by the recombination of electrons and holes. emit heat-producing infrared rays. No light would be produced if the LED was reverse-biased.
  • The potential barrier of a light-emitting diode is raised to enhance the frequency of the light it emits. 
  • Therefore, a higher value of voltage is needed for a higher frequency to produce the same amount of current.

Hence the correct answer is option D.

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