What is the relationship of the current-voltage characteristic and the color of the Red, Yellow, Green, Blue and White LEDs? What is the difference between the current-voltage characteristic of the white LED comparing to the other lights? Is White LED similar to any other LED? When measuring the current-voltage of the 5 LED lights (Red, Yellow, Green, Blue and White) LEDs, what observation do you make? What's different about the white LED comparing to the other lights? ..

The following are a number of statements about opto-electronic devices and materials. Some are TRUE and some are FALSE. i. You can make light emitting diodes from any direct band-gap semiconductor. ii. You can make a laser from silicon. iii. You can make a light emitting diode from GaAs. iv. Light emitting diodes work in reverse bias. v. Photodiodes often work in reverse bias. vi. A solar cell does not require an external bias voltage to work. Which of the following statements is TRUE: (v) and (vi) are TRUE (iv) and (v) are TRUE (iii) and (iv) are TRUE

Could you please go into more detail about how the Ac equivilant model was created? thank you

please help