I needa know all abwt waves the whole chapter- or just the main points plz :)

Posted Tue 5th June, 2012 @ 10:48 by в
Edited by в on Wed 6th June, 2012 @ 09:46

Waves hmmm

well u r doin GCSE so the things u need to know are below:

1. All EM waves travel at the same speed through a vacuum (3x10^8 m/s)
2. As u move from radio waves to gamma rays, the frequency increases  and the wavelength decreases
3. wave speed = wavelength X frequency
4. 1/Time period = frequncy and 1/frequency = time period !!! (A must know !!!! )
5. Amplitude= is the height of a wave from rest to a peak or trough
6. Wavlength= is the distance for one complete wave cycle from begining to end!
7. Frequency = is the number of waves per unit time
8. EM wave order is: radio, microwave, infrared, visible light, ultraviolet light, X-Rays, Gamma rays!
9. U have to know the uses of each EM wave :
Microwaves: used to heat up food by heating the water molecules in food.
Infrared:
used in thermal imaging
Visible light: torches ===> to see =P
ultraviolet light: used in sun beds/tanning booths  and also used in fluorescent lights X-rays:  used to take images of dense material in a human body==> usually bones Gamma: used to kill small cancerous cells by focusing many waves at a single point!
10. Analogue signals are more likely to be interfered with than digital due to which is what makes digital signals better quality as they can be decoded easily when there are interferences.

im not sure if u need anymore but i hope other people post sum stuff becuz im giving u information which i had to learn n that might not be the same now so anyway hope i have helped!!!

= D

Answered Tue 5th June, 2012 @ 15:49 by Braniac

basically (actually im not so sure u still need to know this) 1/time period is used when in a exam they give u a oscilloscope and it has a certain wave. They will either tell u how many seconds each square is and u will have to count how many squares it takes to make one wave and then multiply it by the time for each square. Then they may ask u to work out the frequency of that particular wave using the infromation u have, then u just do 1/ the time u worked out to complete one wave and that will get u the frequency!!!!!

hmmm i know it is not really said well  bu till try n find a picture to show wot i mean!!!

look at this link it explains wot i mea;

http://www.cyberphysics.pwp.blueyonder.co.uk/topics/waves/Oscilloscope/oscilloscope.htm

Answered Wed 6th June, 2012 @ 17:11 by Braniac

Aww thanx Beelal ;)

Answered Tue 5th June, 2012 @ 18:12 by в

nps ;D bbe **

Answered Tue 5th June, 2012 @ 20:06 by Braniac

;)  "wink" LOL -**-

yueee saved mehh lyf btw :D

Answered Wed 6th June, 2012 @ 09:28 by в
Edited by в on Wed 6th June, 2012 @ 09:31

heyy soz Beelal

buhh wat does this meen >

1/Time period = frequncy and 1/frequency  ??

Answered Wed 6th June, 2012 @ 09:44 by в

thnx i kinda get it ..maybe i dnt needa knw it ?

Answered Wed 6th June, 2012 @ 21:15 by в