Science and Technology community quiz

[ruler501]

Procedures :-
1) A asks a question, the rest will try to answer.
2) A must confirm which answer is correct.
3) Person (say B) with confirmed correct answer then asks the next question.
4) A cannot play again until B's turn is over (to prevent the thread turning into a 2 person spam party).
5) Repeat.
6) If person asking question doesn't login to confirm answers within 72 hrs of his question being posted, any one can ask a new question.
7) If no one can answer question within 72 hrs or can't get the right one, questioner can ask again.
Definitely no Net or book searches. The answers would be too easy to find if you were allowed to use Google and the like.
9) If answer has been confirmed and the new questioner hasn't set a question in 72 hours, anyone can ask the new question.
10) You can ask questions on any aspect of science (including the history of science and scientists) but let's try not to resort to 'm=3kg a=2ms-2 please work out F'. Come on, guys. Technology questions are also allowed and encouraged.
11) Mathematics is also allowed, but take heed of rule 10).


first question what are the two kinds of Fermions and what are there difference?

[willrandship]

Quarks and Leptons, the main difference is that Quarks make up Protons and Neutrons whereas Leptons make electrons, neutrinos, and some heavier particles.

[jnesselr]

Quarks and Leptons, the main difference is that Quarks make up Protons and Neutrons whereas Leptons make electrons, neutrinos, and some heavier particles.

I didn't have a clue. And no wonder. It's quantum mechanics!

[ruler501]

correct you get the next question

[willrandship]

Yay!

In holography, why does convergence of two beams from one laser that were split earlier (providing they are set up right) create a point of light where they converge?

There is a 1 word answer I will accept, or an explanation

[DrDnar]

interference

[AngelFish]

In holography, why does convergence of two beams from one laser that were split earlier (providing they are set up right) create a point of light where they converge?

There could be multiple possible answers, depending on what you mean. If the bright spot is independent of setup, then it's the result of particulates scattering light, which is also why laser beams often have bright motes of dust floating through them.

If it's dependent on setup, then you can have either constructive or destructive interference, which will increase the intensity of the light at that location or decrease it, respectively. However, you still won't be able to see the interference unless you stare directly into the beams or the aforementioned scattering is present.

EDIT: I just noticed the part about "set up right" 

[willrandship]

But I happened to be looking for interference anyways so DrDnar gets it.

[DrDnar]

Hah. It was a guess.

What is the starting address of an assembly program on the TI-83+/84+/SE? Remember, no looking it up!

I won't near an Internet connection again until late Sunday, so somebody else can confirm an answer for me, I guess.

[DrDnar]

Am I the only person who memorized that?

[ruler501]

Yes plus I don't have a Ti-84 only a keypad for my Nspire

[calcdude84se]

$9D95
Has the thread become ignored or something?

[Munchor]

$9D95
Has the thread become ignored or something?

I think that's it, and know it by heart. I hadn't checked the thread. We g2 wait for his response so you can ask a new question, but I'm sure it's correct.