The colour of light emitted by a light emitting diode (LED) depends upon the
Correct answer: D. Material of semiconductor
- A. Amount of current
- B. Velocity of the light
- C. Amplitude of the light
- D. Material of semiconductor
Explanation
The color of light emitted by a light-emitting diode (LED) is determined by the material of the semiconductor used. This is because different semiconductor materials have different energy band gaps, which determine the specific wavelengths of light emitted. The wavelength corresponds directly to the color of the light. The other options are incorrect because:The amount of current affects the brightness, not the color.The velocity of light is constant in a medium and does not impact the color emitted.The amplitude of light influences intensity, not color.
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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.
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