the color of light by light emitting diode depends upon
Correct answer: D. type of semiconductor
- A. forward voltage
- B. reverse current
- C. forward current
- D. type of semiconductor
Explanation
The color of light emitted by a light-emitting diode (LED) depends on the d. Type of semiconductor used in its construction.Here's why:LEDs and semiconductors: LEDs are semiconductor devices that convert electrical energy into light energy. Different types of semiconductors have different band gaps, which are the energy differences between the valence band and conduction band.Band gap and light emission: When an electron in the conduction band recombines with a hole in the valence band, it releases energy in the form of a photon. The energy of the emitted photon (which determines its color) is directly related to the band gap of the semiconductor material used in the LED.Therefore, the type of semiconductor used in the LED determines the band gap and consequently, the color of the emitted light
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Electromagnetic Waves
Electromagnetic waves consist of mutually perpendicular, oscillating electric and magnetic fields that also remain perpendicular to the direction of propagation. They travel through vacuum at the speed of light and include radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays. Unlike mechanical waves, they do not require a material medium.
Practise Alternating Current
592 free Alternating Current MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electromagnetic Waves questions
a voltmeter has resistance of 2000 ohms and it can measure up to 2V. if we want to increase its range to 10V then required resistance in series will be
the voltage that is applied across the X plates is usually provided by a circuit that is built in the CRO. it is known as
The concept of domain is related to
Which electromagnetic radiation has the longest wavelength?
Which one of the following could be the frequency of ultraviolet radiation?
Which type of electromagnetic radiation has a greater wavelength than red light?