Is Our Children Learning Part II: All radioactivity is man-made.
 

Please answer the following question without looking it up.

All radioactivity is man-made. True or false?

False, I believe... Fusion happens in the sun.

Actually, pure fusion, such as that which happens in the sun, is not a radioactive process.

Edit: WetWired informs me I may be wrong. I am not convinced, but I'll look into it. Sorry if I have misinformed.

Edit #2: The disagreement seems to be more semantic than anything.

Very VERY false.

Hm, can you give me some examples of natural radioactivity?

No.

Fuck you WW

Radioactive elements when they happen to collide.

The fact that you can see.

Looking at reflected light is radioactive?

Uranium.

All light is electromagnetic radiation.

Isn't everything on earth radioactivity? lol. These do seem like trick questions. It's gotta be the wording.

Nah, but the surface of earth is showered in radioactivity. Our eyes evolved to detect the visible light spectrum of electromagnetic waves. Our eyes could have evolved to see radio waves, infrared, etc. but they didn't. We don't really see the object itself, just visible light that has reflected.

http://en.wikipedia.org/wiki/Image:EM_spectrum.svg

The visible light that we see is a very thin part of the electromagnetic spectrum. Below it in frequency are things such as radio waves, infrared, microwaves, etc. Above the visible light spectrum is increasingly more energetic and with much smaller wave lengths (higher frequency). Ultraviolet, x-rays, and then lastly and most dangerously, gamma rays. The wavelength of gamma rays is incredibly small, i.e. cellular level and below.

Alright. I don't know shit about radios :P.

Nope.

FM is frequency modulation. The amplitude of the output signal is dependant on the dominant frequency of the broadcast frequency at the moment (the broadcast frequency varies within a certain range on purpose).

AM is amplitude modulation. The amplitude of the output signal is dependant on the amplitude of the signal at the broadcast frequency at the moment.

AM equipment is much simpler since you just have to tune to that frequency and your signal strength is your output signal, whereas FM you have to track the frequency change. FM is clearer because it's less vulnerable to noise and differences in station distance.

ROY G BIV!



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100% are correct.

Ez, i 2 lrn more