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Toe Tyd Begin Het

  • Aan die begin, toe daar nog geen heelal was nie, was daar ook nie tyd nie. Die teorie is dat die begin van alles soos volg verloop het:
Tyd Gebeure
0 Sekondes
  • Heelal begin as klein warm balletjie
10 -35 sekondes
  • Ruimte swel uit teen ’n duisend biljoen biljoen biljoen keer per sekonde
10 -32 sekondes
  • Ruimte word oorstroom met energie en materie soos kwarks
10 -8 sekondes
  • Materie en antimaterie ontstaan
3 minute
  • Kwarks smelt saam en vorm waterstof en helium
1 miljoen jaar
  • Gaswolke vorm lang stringe
300 miljoen jaar
  • Stringe wolke vorm wat sterre en sterrestelsels vorm

Aktiwiteit 2:

Om jou kennis te toets

1. Waaruit het die heelal aan die begin bestaan?

2. Wat is die “Oerknal” of “Big Bang”?

3. Hoe het die eerste elemente ontstaan?

4. Wat is ’n kwark?

5. Hoe het die volgende elemente ontstaan?

a) Be

b) Fe

6. Noem die vier belangrikste kragte in die heelal?

7. Wat is antimaterie en wat gebeur as dit naby materie kom?

Assessering van begrip ten opsigte van die teorie oor die ontstaan van die heelal:

Verstaan jy die teorie?

[LU 2.3]

Om ‘n opdrag oor teleskope te skryf

Skryf ’n projek van vier bladsye oor die gebruik van teleskope en die basiese bou daarvan. Lewer in op ’n datum soos bepaal deur jou opvoeder.

  • Vind meer uit spesifiek oor die volgende:
  • Hubble-teleskoop
  • Mcmath-sonteleskoop in Arizona, VSA
  • Reuse radioteleskoop – die Arecibo – in Puerto Rico
  • Die SAAO in Sutherland, Suid-Afrika
  • Die SALT (Southern African Large Telescope) by Sutherland wat in 2004 voltooi is
  • Die radioteleskope by Hartbeeshoek, Gauteng
  • Die SKA
  • Sluit jou verslag af met ’n oorsig oor die waarde van die teleskope vir die wetenskap.[LU 1.1; LU 1.2; LU 1.3; LU 3.1]

Die Sterrestelsels – “Galaxies”

  • Ons son is slegs een van ’n massiewe versameling van ongeveer twee biljoen sterre wat in die vorm van ’n gebakte eier met ’n deursnit van 100 000 ligjare in die hemelruim lê! As jy saans opkyk na die hemelruim en ’n ligband van fyn sterretjies sien, kyk jy na die Melkweg . Dit is eintlik net ’n blik op die randjie van ons sterrestelsel! Die Griekse woord “galakta” beteken “melk”.
  • Die aarde lê sowat 300 000 ligjare weg van die middel van ons sterrestelsel.
  • ’n Ligjaar is een van die belangrikste EENHEDE in die ASTRONOMIE wat jy moet ken. Wetenskaplikes gebruik sulke eenhede omdat m en km onsinnig raak in die wye uitspansel met die groot afstande.

Aktiwiteit 3:

Om afstand in ligjare te bereken

  • ’n Ligjaar = die afstand wat lig in een aardse jaar aflê, indien dit beweeg teen ’n snelheid van 300 000 km/s -1

1. Bereken: ’n ligjaar

  • 365,25 dae x 24 uur x3 600 sekondes x 300 000 km/s -1 = ......................................
  • Dus: .................................................. kilometer
  • Miljoen, biljoene en triljoene?
GETAL 10 N NAAM VOORVOEGSEL
1 000 000 10 6 MILJOEN MEGA
1 000 000 000 10 9 BILJOEN GIGA
1 000 000 000 000 000 10 15 TRILJOEN PETA

2. Hoeveel sterre is in ons hemelruim?

3. Druk 10 biljoen biljoen uit as ’n getal (dit sou die voorvoegsel exa hê).

4. Nog ’n belangrike eenheid is die ASTRONOMIESE EENHEID (AU) wat die afstand van die son na die aarde voorstel, naamlik 150 miljoen kilometer .

Questions & Answers

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natuurwetenskappe graad 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11068/1.1
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