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Old 10-28-08, 05:45 PM   #1
Hickeydog
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Need chemistry/phiscis help

These questions are starting to piss me off....anyways

Cobalt-60 is a radioactive isotope used to treat cancers of the brain and other tissues. A gamma ray emitted by an atom of this isotope has an energy of 1.33 MeV (million electron volts; 1 eV = 1.602e-19 J). What is the frequency (in Hz) and wavelength (in m) of this gamma ray?

I used the equation E=HC/lambda (E is energy, H is Plank's constant, 6.63e-34, C is the speed of light, 3.0e8, and lambda is the wavelength.) I solved for lambda and got HC/E=lambda. Plug and chug and I get 1.2e-6m. Only problem is, that's not the correct answer. So what am I doing wrong?

Edit: Okay. First problem was that I didn't convert 1.33 MeV to J. So I re-did the calculations with 2.13066e-19J and came out with 9.3e-7m and that's still wrong. So my question still stands.
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What's frightening is how coherent Hickey was in posting that.

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Old 10-28-08, 05:46 PM   #2
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First I think you may need some spelling help.







Sorry! I couldn't help myself!
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Old 10-28-08, 05:51 PM   #3
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what was spelled wrong?
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Old 10-28-08, 05:51 PM   #4
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First I think you may need some spelling help.







Sorry! I couldn't help myself!
Me too

(and I can't help with the phiscis question either)

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Old 10-28-08, 05:52 PM   #5
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what was spelled wrong?
physics.

Well, unless it's Fizz-ics or Phizycs or ...
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Old 10-28-08, 05:53 PM   #6
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thanks. figh1fight1figh1fight1
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Old 10-28-08, 05:57 PM   #7
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never mind. I figured the ****ing thing out.
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Old 10-28-08, 05:59 PM   #8
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LOL (and glad ya figured it out)
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Old 10-28-08, 06:03 PM   #9
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and I am about ready to KILL someone



ggggggrrrrrrrrrrrrrrrrrrrrrr

*starts looking for murder weapons*
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Old 10-28-08, 06:05 PM   #10
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slips out the side door ... - it wasn't me ...
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Old 10-28-08, 06:14 PM   #11
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After seeing the title, with likely the worst, incorrect spelling I've seen yet for 'physics', I had to check to see if this was a joke thread. It wasn't
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Old 10-28-08, 06:15 PM   #12
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Wait, did you say you were about to kill someone? Please disregard my last post.
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Old 10-28-08, 06:16 PM   #13
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Quote:
Originally Posted by Hickeydog View Post
These questions are starting to piss me off....anyways

Cobalt-60 is a radioactive isotope used to treat cancers of the brain and other tissues. A gamma ray emitted by an atom of this isotope has an energy of 1.33 MeV (million electron volts; 1 eV = 1.602e-19 J). What is the frequency (in Hz) and wavelength (in m) of this gamma ray?

I used the equation E=HC/lambda (E is energy, H is Plank's constant, 6.63e-34, C is the speed of light, 3.0e8, and lambda is the wavelength.) I solved for lambda and got HC/E=lambda. Plug and chug and I get 1.2e-6m. Only problem is, that's not the correct answer. So what am I doing wrong?

Edit: Okay. First problem was that I didn't convert 1.33 MeV to J. So I re-did the calculations with 2.13066e-19J and came out with 9.3e-7m and that's still wrong. So my question still stands.
You're missing a factor of 1 million.

if 1eV = 1.602E-19, then 1.33 MILLION eV = 1.602E-19 * 1.33E+06 = 2.13066E-13, not -19.
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Old 10-28-08, 07:00 PM   #14
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I think I may submit this thread to fail blog.
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 10-28-08, 09:58 PM   #15
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Carrying units along in your calculations would have immediately revealed the problems. One should always carry units.
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