Few questions about connectors and LED...?

Question

1) What are uses of plugs and sockets?
2) State the applications of co-axial cable in computers and data communication. Which communication cable used?
3) All LEDs are made with same materials like germanium, arsenic then why are they obtained in different colours like red, yellow, green etc.?

These questions are my assignment but I tried to search answers in book, also tried google.... but I didn't get the answers...

As I have to submit this assignment tomorrow itself... I will be very grateful to you if you can give me answers for the above questions today..

thanx in advance

Answer 1

Here are some references:::

NCERT Physics text book for class 12.
Pradeep's Physics for class 12 and many others.

Explanations are quite satisfactory in these.
I dont remember all this stuff because I crammed it at the last moment just before my Physics board exam, n I'm glad its over.
Rather it was the question on LED only that made lose marks!!!!:((

So GOOD LUCK to you!!!!

Answer 2

1) plugs and sockets well on a PC board, its just easier to make an interconnect between boards or to wires so that they do not become loose
2) coax cables. look at the cable people or look at an old NIC. less interference in em
3) basically what the other guy said about band gap and the wavelength of light photon emitted so you'll have your usuall GaAs (GaAs{1-y}P or your GaN. As far as your white LED, thats just a blue LED with a phoshor

Answer 3

1)Plugs and sockets is for connecting between cables, connecting between device and cables to the power supply or to another device. I reckon...

2) Co-axial cable is the cable usually used for TV cable, telephone cable connecting between the central office to the telephone poles etc. You can find out more in wikipedia

3) The colours are dependant on the gas which are filled inside the LED and also the voltage supplied..

and good luck for your assignment! :)

Answer 4

Here's the LED part. They make different colors because the energy of the photons is different. To get higher energy for blue, we need a wide band-gap semiconductor like gallium nitride.