1. How are photons emitted from the LED and from which section of the LED?

2. In a semiconductor diode (as per V-I Characteristics) the current doesn’t flow in the beginning. But at a certain value of the potential, it appears. What has known as the name of this potential?

3. What is the blue color wavelength?

4. Semiconductor Material name that shows the optical property?

5. Can we achieve the population inversion process in LED too?

6. To determine Planck’s Constant, we equate two different energies. The name of these two are;

7. Which material do we use an LED?

8. What is Planck’s constant value?

9. What is the Red Color wavelength range?

10. Why does the Blue color LED stopping potential is greater than the Red color LED?

11. What is the green color wavelength range?

12. Why do not LED starts to glow immediately when you provide biasing to that?

13. Does the LED work in the forward bias or the reverse bias?

14. How photon emits in the LEDs?

15. Who discovered that radiation is in a discrete form of energy?