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November 11, 2025, 05:25:28 am
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Author Topic: TrueTears question thread  (Read 93112 times)  Share 

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NE2000

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Re: TrueTears question thread
« Reply #345 on: October 12, 2009, 07:01:47 pm »
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It's always safer to use 6.63 in everything other than where you know eV or V are explicitly involved
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naved_s9994

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Re: TrueTears question thread
« Reply #346 on: October 12, 2009, 07:34:10 pm »
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Quote from: NE2000 on October 12, 2009, 07:01:47 pm
It's always safer to use 6.63 in everything other than where you know eV or V are explicitly involved

Thanks :)
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TrueTears

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Re: TrueTears question thread
« Reply #347 on: October 14, 2009, 04:49:12 pm »
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Hmmm, for Q 6 light and matter question (link is below), I just realised while flipping my physics exam, why do they have (V s) for stopping voltage? I thought stopping voltage was measured in volts.... http://www.vcaa.vic.edu.au/vcaa/vce/studies/physics/pastexams/2008/2008physics2-w.pdf

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/0

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Re: TrueTears question thread
« Reply #348 on: October 14, 2009, 08:03:53 pm »
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I think they probably meant with 's' as a subscript

(i.e. they weren't giving the units, they were giving the 'symbol')
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TrueTears

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Re: TrueTears question thread
« Reply #349 on: October 14, 2009, 08:06:51 pm »
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Quote from: /0 on October 14, 2009, 08:03:53 pm
I think they probably meant with 's' as a subscript

(i.e. they weren't giving the units, they were giving the 'symbol')
lol I thought they meant Voltage Second.

That was stupid of them...
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naved_s9994

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Re: TrueTears question thread
« Reply #350 on: October 15, 2009, 07:40:12 pm »
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Quote from: TrueTears on October 11, 2009, 10:45:31 pm
Just a few clarifications of some formulas which are not on the course but still pretty fun/useful. Can someone check if they're right or not? I derived them long time ago but can't really remember it now lol.

For double slit experiments regarding the diffraction of light:

1.

Nodal points:

Where: is the horizontal distance of the nodal point to the centre maximum point.
            is the width of the the 2 slits (ie the distance from the middle of 1 slit to the other one)
            is the distance from the centre of the 2 slits to the nodal point. (ie, length of the nodal line)

2.

Where: is the width of the the 2 slits (ie the distance from the middle of 1 slit to the other one)
            is the angle between the nodal line and centre line.

Antinodal points:

Simply change the above formulas, instead of , it will just be .

For single slit experiments regarding the diffraction of light:

Nodal points:

1.

Where: is the horizontal distance of the nodal point to the centre maximum point.
            is the width of the slit
            is the centre of the slit to the nodal point. (ie, the length of the nodal line)

2.

Where: is the width of the slit
            is the angle between the nodal line and centre line.

Antinodal points:

Does not exist for single slit.


So do these work? Anyone gone ahead and tested them?
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TrueTears

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Re: TrueTears question thread
« Reply #351 on: October 15, 2009, 07:42:37 pm »
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Yeah, they're right, checked with teacher today.
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kamil9876

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Re: TrueTears question thread
« Reply #352 on: October 15, 2009, 08:02:55 pm »
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Quote
So do these work? Anyone gone ahead and tested them?
http://en.wikipedia.org/wiki/Thomas_Young_(scientist)
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naved_s9994

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Re: TrueTears question thread
« Reply #353 on: October 15, 2009, 08:07:46 pm »
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You mentioned x(subscript n) is the horizontal distance of the  nodal point to the centre maximum point. For double slit experiments regarding the diffraction of light.

How do you calculate that?  

EDIT: 500 Posts  :D ;) ;D :coolsmiley:
« Last Edit: October 15, 2009, 08:37:38 pm by naved_s9994 »
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TrueTears

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Re: TrueTears question thread
« Reply #354 on: October 17, 2009, 01:53:42 am »
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Another question:



First two are: NO CHANGE, DECREASE respectively.

What's the third one? Rather how do you work it out?
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Mao

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Re: TrueTears question thread
« Reply #355 on: October 17, 2009, 02:02:51 am »
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DC motor: constant voltage. no change
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TrueTears

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Re: TrueTears question thread
« Reply #356 on: October 17, 2009, 02:09:22 am »
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Quote from: Mao on October 17, 2009, 02:02:51 am
DC motor: constant voltage. no change
That's what I thought too, but the answer says increase.

Apparently their reasoning is: "Increased (zero at horizontal)"

huh?
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kamil9876

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Re: TrueTears question thread
« Reply #357 on: October 17, 2009, 02:16:11 am »
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yeah i would've thought it was increase as well since as it gets more vertical the flux approaches 0, and as flux approaches 0 the gradient of it approaches it's maximum. But the word DC and then Mao's post scared me :P.
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kurrymuncher

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Re: TrueTears question thread
« Reply #358 on: October 17, 2009, 02:19:05 am »
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Quote from: TrueTears on October 17, 2009, 02:09:22 am
Quote from: Mao on October 17, 2009, 02:02:51 am
DC motor: constant voltage. no change
That's what I thought too, but the answer says increase.

Apparently their reasoning is: "Increased (zero at horizontal)"

huh?

What! how could the current be zero when it is a motor lol?

what brand is this?
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TrueTears

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Re: TrueTears question thread
« Reply #359 on: October 17, 2009, 02:21:35 am »
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Quote from: kurrymuncher on October 17, 2009, 02:19:05 am
Quote from: TrueTears on October 17, 2009, 02:09:22 am
Quote from: Mao on October 17, 2009, 02:02:51 am
DC motor: constant voltage. no change
That's what I thought too, but the answer says increase.

Apparently their reasoning is: "Increased (zero at horizontal)"

huh?

What! how could the current be zero when it is a motor lol?

what brand is this?

TSSM 2008, they have a habit of making some weirdo questions...
« Last Edit: October 17, 2009, 02:25:42 am by TrueTears »
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