<< Chapter < Page Chapter >> Page >

As die deursnit van die son in die notasie 1,5 x 10 6 geskryf word, hoe sou jy die AU se notasie skryf?

5. Wat is die deursnit van ons sterrestelsel dus?

Assessering van berekeninge:

Was jou berekenings korrek?

[LU 2.4]

Het jy geweet?

Die grootste struktuur in die heelal is bekend as “the great wall” – ’n kombers van sterrestelsels wat 500 miljoen ligjare lank en 16 miljoen ligjare dik is.

  • Ons sterrestelsel is een van biljoene sulke reusestergroepe of sterrestelsels! Dit is maar sover ons met ons grootste en sensitiefste teleskope kon vasstel.
  • Die naaste volgende sterrestelsel aan ons is die ANDROMEDA- sterrestelsel. So ’n sterrestelsel bestaan uit groepe of bondels sterre.
  • Tussenin is daar reusewolke van gas en partikels wat ons nebulae noem. Hulle is die geboorteplekke van sterre.
  • Die teorie is dat ’n warm wolk gasse – die solar nebula - vier en ’n half biljoen jaar gelede om ’n nuutgevormde son gedraai en begin afkoel het. Tydens die afkoeling is biljoene druppeltjies gevorm wat aan mekaar begin vaskleef het. So is planete gevorm.
  • Dit het egter nog ’n halfbiljoen jaar geneem om genoegsaam af te koel en ’n kors te vorm.

Aktiwiteit 4:

Om definisies neer te skryf

1. ’n Ligjaar is

2. Die Melkweg is

3. Die Andromeda is

4. ’n Nebula is

5. Die rede vir die gebruik van eenhede soos ligjare en AU is

Assessering van definisies:

Was jou definisies korrek?

[LU 2.4]

Assessering

LU 1

Wetenskaplike Ondersoek

Die leerder is in staat om met selfvertroue op weetgierigheid oor natuurlike verskynsels te reageer, en om binne die konteks van wetenskap, tegnologie en die omgewing verbande te ondersoek en probleme op te los.

Dit word bewys as die leerder:

1.1 ondersoeke beplan;

1.2 ondersoeke uitvoer en data versamel;

1.3 data evalueer en bevindinge kommunikeer.

LU 2

Konstruksie van Wetenskapkennis

Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewings- kennis toe.

Dit word bewys as die leerder:

2.1 betekenisvolle inligting kan oproep;

2.2 inligting kan kategoriseer;

2.3 inligting kan interpreteer;

2.4 kennis kan toepas.

LU 3

Wetenskap, die Gemeenskap en die Omgewing

Die leerder is in staat om begrip van die onderlinge verband tussen wetenskap en tegnologie, die samelewing en die omgewing te toon.

Dit word bewys as die leerder:

3.1 wetenskap as ’n menslike aktiwiteit verstaan;

3.2 die volhoubare gebruik van die aarde se hulpbronne verstaan.

Memorandum

AKTIWITEIT: VRAE

1. geen materie – een balletjie kleiner as ’n atoom; daarna ’n brousel van deeltjies en kragte

2. superkrag waarmee kleiner balletjie in materie uitgebars het

3. ’n klomp kwarks was saamgepers om waterstof te vorm

4. ’n subatomiese partikel

5. a) He-atome se samevoeging

b) C-atome onder hewige temperature

6. Swaartekrag, elektromagnete, sterk kernkragte en swak kernkragte

7. teenoorgestelde van materie – kanselleer materie uit

AKTIWITEIT: BEREKENING

1. 10 miljoen miljoen kilometer

2. ongeveer 2 biljoen

3. 10 18

4. 150 x10 6

5. 100 000 x 300 000

AKTIWITEIT: DEFINISIES

1. die afstand wat lig in een aardse jaar aflê teen ’n snelheid van 300 000 km.s -1

2. versameling van biljoene sterre waarvan ons son een is

3. naaste volgende sterrestelsel

4. reuse gaswolke tussen sterrestelsels

5. om getal denkbaar te maak

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Natuurwetenskappe graad 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11068/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 9' conversation and receive update notifications?

Ask