Higher Physics 2008 - How did you find it?

BillyLiu

*in robotic voice*

Kill....kill....kill...

Haha, joke. Xenu = Scientology god? I never knew that! :p:

Well he's more like a prehistoric super-powerful alien that brought billions of people to Earth and killed them all with hydrogen bombs.

Or so they say. :rolleyes:

Reply 421

I'm more of an ex anon. Don't really go there anymore :p:

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Reply 422

Xeraii

Well as they say Higgins, you can take the man out of /b/, but you can't take the /b/ out of the man! :wink:

I sense this topic is becoming rapidly divergent.

Reply 423

Jord91

ukdragon37

Did anyone get the drift that I chose the name "Xenu" because it's the name of the Scientologist "god"? (I hope there's no scientologists on here :s-smilie:

)

I'm a scientologist :smile:

Now...

Give me your money :indiff:

Or suffer the consequences :indiff:

Reply 424

Jord91

I'm a scientologist :smile:

Now...

Give me your money :indiff:

Or suffer the consequences :indiff:

Hahaha

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Reply 425

Jord91

Original post by &#9500

Hahaha

.

Seriously

lol, I'm kidding btw :blush:

Reply 426

kotsikos

For the LED question i thought it was blue bcoz its a negative voltage and the yellow is in forward biased and that would just pull the depletion layer furthur apart while the blue LED is reverse biased and would conduct with a negaive voltage

Reply 427

kotsikos

i thought the LED question was blue bcoz it was a negative voltage and the blue was in reverse biased so surely it would conduct.....the yellow was in forward biased and a negative voltage would pull the depletion layer further apart

Reply 428

kotsikos

For the LED question i thought it was blue bcoz its a negative voltage and the yellow is in forward biased and that would just pull the depletion layer furthur apart while the blue LED is reverse biased and would conduct with a negaive voltage

Nope if it is negative voltage then yellow is forward-biased and blue is reverse-biased. Current flow (from lower voltage terminal to higher voltage terminal, in this case Vo=-2.1V to 0V) into the bar bit on the LED not the triangle.

Reply 429

I wrote it was the yellow LED because i had no idea what one it was and just guessed :p:

. For my explanation i said because the output voltage is negative and current will flow from the 0v. Would that get me any marks? haha

Reply 430

Well you got the correct answer and justified it by saying the voltage is negative, but the current won't flow from 0v and you didn't mention the yellow LED is forward biased if voltage is negative/cathode connected to current source etc.

1 out of 2 I would say

Reply 431

That's alright. It's 1 more than what i expected :smile:

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Reply 432

Jord91

I didn't say forward-bias :s-smilie:

I just said the yellow LED was in the correct position to allow the negative output voltage to pass through where as the blue was the wrong way around :s-smilie:

do you think I would get the marks :confused:

Reply 433

I'm not sure. Examiners are sometimes very harsh about the wording of explaination questions :frown:

I think you will get credited if you give some kind of description about the orientation of the LED (it's in forward-bias, "correctly connected", cathode/anode etc.) but of course I don't know exactly what the correct wordings will be.

Just hope for the best and if you have shown you know the physics in the question they will sure to give you the marks :wink:

Reply 434

Would it have helped if i attached a £20 note onto my paper? haha

Reply 435