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.
Last updated
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.
Practise Electronics
660 free Electronics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
a certain transistor has collector current of 10 mA and a base current 40 uA. what is the current gain of the transistor
A light emitting diode (LED) emits light only when it isI. unbiasedII. reverse biasedIII. forward biased
A light emitting diode produces light when
A logic gate has four inputs. Its possible input combinations will be:
A n-type semiconductor is formed in an extrinsic semiconductor when