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#87633 Advanced Physics Notes

Posted by jambo david on 16 August 2006 - 06:39 PM in Physics

QUOTE(John @ Aug 16 2006, 06:43 PM) View Post

Picking up a A-Level Physics book will be your best bet for the time being i would think.

Is it a similar course huh.gif



#87610 Advanced Physics Notes

Posted by jambo david on 16 August 2006 - 03:26 PM in Physics

Just wondering what the best notes to use are. Scholar hasn't updated my subjects and HSN doesn't have notes



#83965 Writing up PPAs

Posted by jambo david on 14 June 2006 - 02:52 PM in Chemistry

How exactly should they be structured? I need to write up aspirin determination



#81749 Acid or Base

Posted by jambo david on 25 May 2006 - 10:02 PM in Chemistry

I know this is a pretty simply thing but I'm just slightly confused. How do you know whether something forms an acid or a base? unsure.gif

Sodium Hydroxide Solution + Aluminium Oxide --> Sodium Aluminate Solution

State whether aluminium oxide is behaving as an acidic oxide or as a basic oxide in this reaction sad.gif



#80017 Appealing if ill?

Posted by jambo david on 19 May 2006 - 12:43 PM in Physics

Thanks everyone you've given me a little confidence for my result. I'll just wait and see what it arrives as smile.gif



#79405 Appealing if ill?

Posted by jambo david on 17 May 2006 - 10:04 PM in Physics

QUOTE(Dave @ May 17 2006, 10:20 PM) View Post

since you sat the paper i think it will just be a normal appeal but i would make sure its noted that you were ill and had to leave because you became to ill. Shows that you werent just not studying and couldnt answer the questions

So I could end up with a complete fail! Is it possible to an A? I'm starting to wish i never turned up to the exam now sad.gif



#79373 Appealing if ill?

Posted by jambo david on 17 May 2006 - 08:59 PM in Physics

Today I was sick before the exam and then felt a little better so started the paper but 30 mins in i was feeling very sick and had to leave. I've got a doctor's letter but does anyone know if I'll get a good grade? I got an A in my prelim and did very well in all the NABs sad.gif



#78695 Impulse question

Posted by jambo david on 15 May 2006 - 03:51 PM in Physics

How can the speed of a bead leaving a tube be calculated from the mass and impulse?



#78648 2000 Q9

Posted by jambo david on 15 May 2006 - 02:19 PM in Physics

Right there's a ciruit with two resistors in parallel with an ammeter on one branch and a switch(S) on the other and then (not in parallel now) there's another resistor with a voltmeter over it.

THe question is

"in the following circuit, the supply has negligible internal resistance

switch S is now closed.

Which row in the table shows the effect on the ammeter and voltmeter readings?"

Sorry i can't use a diagram and can't explain it very well, what happens to the voltmeter and ammeter readings and why?



#77611 An Advancement of Learning

Posted by jambo david on 09 May 2006 - 08:54 PM in English

I'm a little stuck here and looking for an extra couple of paragraphs. Can anyone send me an essay about the theme of fear that would be able to help me



#77610 King Billy

Posted by jambo david on 09 May 2006 - 08:50 PM in English

QUOTE(laurah @ Apr 19 2006, 06:34 PM) View Post

actually its about Billy Fullerton a gang leader, but thx ill try those (paniced and didn't occur to me stupid or what?) thx for your help
*** tongue.gif laurah cool.gif ***

as in the billy boys? I don't get taught about stuff like that at my school. Ours are all Seamus Heaney, Ursula Fanthorpe etc.



#76189 log question

Posted by jambo david on 25 April 2006 - 08:56 PM in Problem Questions

QUOTE(Steve @ Apr 25 2006, 09:17 PM) View Post

For part (a), all you have to do is find m when t = 5. This is because the formula tells you the mass after t years. Also m_0 is the original mass, so m_0=400.

i get that it goes to 400e^-0.15 but i don't understand what to do after that



#76172 log question

Posted by jambo david on 25 April 2006 - 07:56 PM in Problem Questions

In a radioactive substance, the mass m grams and time t years is given by m=m0e^(-0.03t), where m0 is the original mass

a)If the original mass is 400 grams, what is the mass after 5 years?
b)How long does it take for the substance to decay to half its original mass?



#76169 Unit 3 Extension Test

Posted by jambo david on 25 April 2006 - 07:36 PM in Mathematics

I have one tomorrow, are there any past papers(you know what i mean) anywhere? scholar?



#76084 Photoelectric Emission - Help?

Posted by jambo david on 24 April 2006 - 08:31 PM in Physics

QUOTE(*Kiran* @ Apr 24 2006, 08:58 PM) View Post

Thanks guys. This helped me alot also.
Much appreciated! biggrin.gif

Yip, thanks. I really appreciate it



#76053 Photoelectric Emission - Help?

Posted by jambo david on 24 April 2006 - 05:53 PM in Physics

QUOTE(gsmushet1 @ Apr 24 2006, 06:49 PM) View Post

It is destroyed as all of it's energy is given to the electron in the form of kinetic energy.

So how come more light is created, 1 photon is absorbed, 1 is produced. I don't mean to seem like a dumbass, just want to make sure i'm happy with how it works smile.gif



#76044 Help with wavelength of laser question

Posted by jambo david on 24 April 2006 - 05:34 PM in Physics

QUOTE(dfx @ Apr 24 2006, 06:18 PM) View Post

Hmmm... have they given any information about the work function?

nope just exactly as i wrote above. It's scholar though and i know they have a few mistakes biggrin.gif



#76041 Help with wavelength of laser question

Posted by jambo david on 24 April 2006 - 05:08 PM in Physics

QUOTE(dfx @ Apr 24 2006, 05:50 PM) View Post

The formula is f = v/lambda.

Sorry

Photons with a frequency of 6.45*10^14 Hz are incident on excited atoms, causing the atoms to emit their excess energy.

Calculate the wavelength of the laser light produced. Give your answer to the nearest nanometre



The answer i got was 4.65*10^-7 however, the answer should be .465*10^3 blink.gif



#76035 Help with wavelength of laser question

Posted by jambo david on 24 April 2006 - 04:03 PM in Physics

Photons with a frequency of x 10 14 Hz are incident on excited atoms, causing the atoms to emit their excess energy.

Calculate the wavelength of the laser light produced. Give your answer to the nearest nanometre.

ohmy.gif



#76028 Photoelectric Emission - Help?

Posted by jambo david on 24 April 2006 - 03:19 PM in Physics

QUOTE(gsmushet1 @ Apr 23 2006, 11:13 PM) View Post

QUOTE(jambo david @ Apr 23 2006, 04:07 PM) View Post

I'm really confused about how it works. I don't suppose anyone has time for a little explanation?

p.s. Do you guys get paid for helping us?


Well the electrons that orbit an nuclues do so at different heights from the nucleus known as "energy levels". Each level has a particular energy assigned to it. When a photon that has energy equal to the energy difference of two levels becomes incident on the atom then an electron on that level is given enough energy to move up another energy level(into excited state). If an electron in the excited state is given even more energy, then it is given enough energy to be released from the atom and is then known as a "photoelectron" which has just undergone "photoelectric emission".

I don't think they get paid:S..i'm just a random guy, not involved with the site in anyway.

Thanks, so does the photon that's causing the stimulated emission get absorbed or does it bounces off



#75965 Languages

Posted by jambo david on 23 April 2006 - 07:53 PM in Computing

I don't suppose anyone can quickly explain the difference between scripting , imperative, declaritive etc. languages?



#75938 Photoelectric Emission - Help?

Posted by jambo david on 23 April 2006 - 03:07 PM in Physics

I'm really confused about how it works. I don't suppose anyone has time for a little explanation?

p.s. Do you guys get paid for helping us?



#75907 Slighly not higher but maths none the less

Posted by jambo david on 23 April 2006 - 09:54 AM in Mathematics

QUOTE(nathanm @ Apr 23 2006, 12:35 AM) View Post

QUOTE
known as proof by contridiction. This means that your assumption that a=b is wrong


so in fact, a notequal.gif b ?

but could it not be a = b = 0?

a=b
a=b[/=]0



#75874 Slighly not higher but maths none the less

Posted by jambo david on 22 April 2006 - 10:41 PM in Mathematics

QUOTE(Dave @ Apr 22 2006, 10:51 PM) View Post

known as proof by contridiction. This means that your assumption that a=b is wrong

eh? I dunno. a-b=0



#75852 Slighly not higher but maths none the less

Posted by jambo david on 22 April 2006 - 08:33 PM in Mathematics

A friend showed me a little series of equations the other day, i can't remember them but someone here might know them. It started off a=b and ended 2=1

edit- found it:D



a = b

a^2 = ab

a^2 − b^2 = ab − b^2

(a − b)(a + b) = b(a − b)

a + b = b

2b = b

2 = 1



I worked it out why it doesn't work quite quickly biggrin.gif