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

2. What is Planck’s constant value?

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

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

5. What is the Red Color wavelength range?

6. What is the blue color wavelength?

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

8. What is the green color wavelength range?

9. Which material do we use an LED?

10. Semiconductor Material name that shows the optical property?

11. How photon emits in the LEDs?

12. 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?

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

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

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