Senior Science Discussion Thread

[studybuddy7777]

Well that's really just utilising the red light that gets emitted alongside IR in my opinion.

Well this is Senior Science not Physics. People seem to be a bit more relaxed on the technicalities here as some people are lucky to remember the difference between IR and visible light

[AngelicOnyx]

Hey AngelicOnyx, sorry for the delay.

Visible light is used in Information Systems. So while you could talk about how we use it for vision, I don't recommend it as vision is a very limited communication. You don't just have to just limit it to optical fibres however.

Actually for vision, you could go on the path of talking about non-verbal communications (eg billboards, smoke signals, posters, mail etc) as vision is needed for it, but don't go talking about how are eyes are important because we see out of them. Sorry if I'm conflicting as well but I'm doing my best and information systems isn't my best topic.

EDIT: Also dont forget that infra-red can be classified under visible light so the use of laser beams and all that could also be brought in to the discussion.

Thanks for the clarification Never heard about the infra-red thing though actually, we got it drilled into us that they were different 

[vincentso69]

Hey guys, does anyone know if we need to know how to read binary

like 000001 0000101 and stuff

(for information system)

[studybuddy7777]

We only really need to know the very basics. Eg

If 110 codes for 6
and 1011 codes for 11
What does 1111 code for?
a) 12
b) 15
c) 16
d) 20
Answer is below!

Spoiler

The answer is B (looking at the BBcode for this is confusing lol )

Got it right? Congratulations!
Got it wrong? Don't worry there is an easy way to remember.

2³+2²+2¹+2⁰= binary code.
There is 1 in the 2³ coloumn, so +8. There is also a 1 in the 2² coloumn (+4) 2¹ (+2) and 2⁰ columns (+1)

Add up 8+4+2+1 and you will get 15!

Say 1001 for example. It would be 9 because there is a 1 in the 2⁰ and a 1 in the 2³ column. This is 8+1 = 9.

Hope this helps!

[vincentso69]

We only really need to know the very basics. Eg

If 110 codes for 6
and 1011 codes for 11
What does 1111 code for?
a) 12
b) 15
c) 16
d) 20
Answer is below!

Spoiler

The answer is B (looking at the BBcode for this is confusing lol )

Got it right? Congratulations!
Got it wrong? Don't worry there is an easy way to remember.

2³+2²+2¹+2⁰= binary code.
There is 1 in the 2³ coloumn, so +8. There is also a 1 in the 2² coloumn (+4) 2¹ (+2) and 2⁰ columns (+1)

Add up 8+4+2+1 and you will get 15!

Say 1001 for example. It would be 9 because there is a 1 in the 2⁰ and a 1 in the 2³ column. This is 8+1 = 9.

Hope this helps!

OMG THANK YOU
this trick is so much easier to under stand

So my prediction for:

1011 = 8 + 0  + 2 + 1 = 11?

[studybuddy7777]

OMG THANK YOU
this trick is so much easier to under stand

So my prediction for:

1011 = 8 + 0  + 2 + 1 = 11?

Yep exactly!! You should nail this in the HSC!

(Yeah, funnily enough I was taught this way in Yr 9 IST [computer tech] but not like this in Senior Science, where you actually have to know it less than IST.)

Good luck!! 6 days to go!

[kawther]

Guys whats the energy transformation in a fax machine? Thanks a bunchh

[RuiAce]

Guys whats the energy transformation in a fax machine? Thanks a bunchh

On the receiving end, it is just
EMR -> Electrical energy (acquire the signals) -> Kinetic energy (printing)

I'm not too sure about the transmitting end. I reckon it's something along this
Light energy (scan) -> Electrical energy (acquire the signals) -> EMR

[vincentso69]

"Identify a firsthand investigation where a data logger may be used and state an advantage of using the data logger.(2)"

How would you guys answer this question?

I did something under the lines of :
"a datalogger can be used when determining trends in the temperature of a certain place over a period of time. An advantage of using a data logger is that you do not need to be physically there for the experiment, as the device will automatically record information for you "

[kawther]

Hey Guys,

Anyone know what happens in the information transfer process? Like message/encode, transmission, decode? Are we supposed to know what happens in detail or just briefly?

[studybuddy7777]

"Identify a firsthand investigation where a data logger may be used and state an advantage of using the data logger.(2)"

How would you guys answer this question?

I did something under the lines of :
"a datalogger can be used when determining trends in the temperature of a certain place over a period of time. An advantage of using a data logger is that you do not need to be physically there for the experiment, as the device will automatically record information for you "

Hey Vincent!
This is good, just make sure you use "computerised/stored onto a computer" in your answer somewhere
Also, you can say ph as well as temp

[studybuddy7777]

Hey Guys,

Anyone know what happens in the information transfer process? Like message/encode, transmission, decode? Are we supposed to know what happens in detail or just briefly?

Hey kawther,
Yeah it wouldn't hurt to know a bit more in depth but normally this is a multiple choice or 1-2 marker saying basically what is the info transfer process?
Thus you just need to know encode, transmit, decode. It is largely self explanatory from there.
Eg The message gets coded, it gets transmitted by satellite, tower (for eg) and then gets decoded so one can read it,

Hope this helps

[VW16]

Hey

Can anyone tell me what to write for the history of a pacemaker?

thanks

[vincentso69]

Hey

Can anyone tell me what to write for the history of a pacemaker?

thanks

I only know 1 aspect of development of the pacemaker.
Which is basically : better batteries overtime (learnt from doing past papers)

[kawther]

Hey kawther,
Yeah it wouldn't hurt to know a bit more in depth but normally this is a multiple choice or 1-2 marker saying basically what is the info transfer process?
Thus you just need to know encode, transmit, decode. It is largely self explanatory from there.
Eg The message gets coded, it gets transmitted by satellite, tower (for eg) and then gets decoded so one can read it,

Hope this helps

Thank you!