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# PHY4 Jun 05 Thread :( watch

1. (Original post by BCHL85)
and what emits light of wavelength 10^-6m ??
wasnt it just a source of IR...i said a radiator
2. (Original post by BCHL85)
I checked, 100m is short-radiowave, I put radiowaves UHF as well
10^-6m I think is IR (microwave is about 1cm ??)
yeh! thats what i put! what did you put as source

originally i put stars, then i changed it to "old fashioned electric heater - one with a heating element"

anyone think i'll get anything for that, lol - couldn't and still can't think of anything else
3. (Original post by mackin boi)
wasnt it just a source of IR...i said a radiator
had to say electirc i think - because teh gas ones in UK homes dont emit IR
4. I just put hot body
5. (Original post by BCHL85)
I just put hot body
wasn't that what they put under visable light? - by the way - what wavelength did you guys put for visable? i put 5x10^-7 - is that in the range?
6. (Original post by Phil23)
wasn't that what they put under visable light? - by the way - what wavelength did you guys put for visable? i put 5x10^-7 - is that in the range?
Yes it is ... but I put the range from 4*10^-7 -> 7.6*10^-7
7. (Original post by Phil23)
and the second bit i found weird was teh spider weeb thingy - i got 16.3 Hz or something ike that
I got 8.17Hz. Cos I put:

wavelength = 2 x distance between 2 nodes
= 2 x 2.4 x 0.25
= 1.2

then f=v/lambda
=9.8/1.2
=8.17Hz
8. (Original post by Phil23)
wasn't that what they put under visable light? - by the way - what wavelength did you guys put for visable? i put 5x10^-7 - is that in the range?
Yes it is ... but I put the range from 4*10^-7 -> 7.6*10^-7
9. I Put 1*10^-8

Tha Range Is > 700*10^-7
10. its getin 2 much for me...i think im not readin nemore
11. (Original post by mackin boi)
I Put 1*10^-8

Tha Range Is > 700*10^-7
The question after that did show you the range of visible light
12. (Original post by sonja)
I got 8.17Hz. Cos I put:

wavelength = 2 x distance between 2 nodes
= 2 x 2.4 x 0.25
= 1.2

then f=v/lambda
=9.8/1.2
=8.17Hz
Same here
13. (Original post by BCHL85)
and what emits light of wavelength 10^-6m ??
Infrared => i said a TV remote control.
14. (Original post by Economist)
Same here
looks like i lost a few marks on that then
15. (Original post by Economist)
Same here
Yay! (well at least if it's wrong, I'm not alone!)
16. (Original post by nas7232)
Infrared => i said a TV remote control.
Same here
17. (Original post by sonja)
Yay! (well at least if it's wrong, I'm not alone!)
lol - few peopel got my answer, and a few got yours - hit and miss which one is right really, unless some uni physicist comes in and tells us the facts
18. i disagree

i measured the half wavelength = x cm

Therefore 1 wavelength = 2x = something

map this => 0.25cm x something = lambda

f = c/lambda = answer [which was same as phils]

i hope it's right
19. Wavelength = 2 x node to node = 2 x 2.4 = 4.8
4.8 x 0.25 = 1.2
9.2 /1.2 = 8.17Hz
20. Oh .... where the hell is that 0.25?

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