ok im studying economics but for some reason i have to take a science course so i chose physics...

anyway i have found out a few questions for my physics test im having tomorrow and if somebody could please help me i would be extremely grateful.... (questions are translated from swedish, dont know the exact terms in english)

Q: Name a type of radiation....

a) where is it located in the spectrum?
b) what is it used for and why?

Q:
80 km
<----------------------------------------------->

40 km 40 km
P<----------------------X----------------------->Q

P and Q are radiomasts and they have a frequency of 1200 hHz and there was something about the speed of light being 3*10^8

How many wavelenghts are there between P and Q?

any help would be appreciated!

EDIT: woops the distances came out wrong, anyway the total distance is 80 km and the distance between P and X is 40 km...
Rig:

Gibson ES-335
Peavy Classic 30
Last edited by bluesmaster at May 27, 2008,
speed of light = frequency x wavelength

go figure
Get off this damn forum and play your damn guitar.
1200 hHz would be 1200000 hertz
Rig:

Gibson ES-335
Peavy Classic 30
For a test on waves 'n' what not, this is pretty simple stuff. If you have to ask us, you probably aren't gonna do too well on the test.

Anywho, the first question is something you can google easily.

2nd question,

wave speed = wave length x frequency

so
speed of light/frequency = wave length = 250m
(assuming in the question, by hHz you meant kHz)

I don't know why X has been given, but 80,000/250 = 320 wave lengths.

would the UV, IR etc be found on this spectrum and if so where?
Rig:

Gibson ES-335
Peavy Classic 30
Quote by Gaz_m2k5
For a test on waves 'n' what not, this is pretty simple stuff. If you have to ask us, you probably aren't gonna do too well on the test.

Anywho, the first question is something you can google easily.

2nd question,

wave speed = wave length x frequency

so
speed of light/frequency = wave length = 250m
(assuming in the question, by hHz you meant kHz)

I don't know why X has been given, but 80,000/250 = 320 wave lengths.

thanks man! thats the answer i got when i did it on my own! anyways these are like the hardest questions that are gonna be on the test, because my high school course is focused on economics and business, the science courses we do are extremely simple...

EDIT: woops double post sorry
Rig:

Gibson ES-335
Peavy Classic 30
Quote by bluesmaster

would the UV, IR etc be found on this spectrum and if so where?

UV = ultraviolet
IR = infrared
Quote by Roger_Waters
^ wow i actually almost missed that hahaha iforgot your a genious

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A car with a velocity of 100km/h and kinetic energy of 347kJ hits a brick wall late at night. If it takes 0.6 seconds to stop, calculate the impulse on the car.