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posted by  Soccer Mom on 10/15/2008 10:29:02 PM  |  status: Live  

electromagnetic radiation

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General Chemistry N/A N/A N/A
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In what region of the electromagnetic spectrum would a wavelength of 5.3 102 nm be placed?



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What would be the frequency and energy of this radiation?
_____________/sec
_________________J

Soccer Mom
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posted by Arcanum on 10/15/2008 10:55:59 PM  |  status: Live
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Soccer Mom's comment:
"You're right. Just in the nick of time. Thanks."
Response Details:
Frequency can be found by λf = c
 
which we will convert over and have f = c/λ
 
Which will be f = (3.00x108m/s) / (530 x10 -9m) = 5.66x1014 s-1
 
Which is about right for frequency of visable light. Horray.
 
For the second part we need to use this formula energy of a photon, since radiation energy is bascially light energy and little photons and such, thats just my idea, so I would use this...
E = hc/λ
 
E = (6.626x10-34)(3.00x108m/s) / (530 x10 -9m) = 3.75x10-19 J
 
Doesn't look too unreasonable, and which should be your answer. :+)
Pffhh, if I knew everything, I would spend my entire time on here answering questions, but until then ill spend my entire time on here asking questions... :+)
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posted by Soccer Mom on 10/15/2008 11:55:21 PM  |  status: Live
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Response Details:

Can you assist me with one more problem?  My answer and someone else response was incorrect. I have no clue, please help.


How much energy resides in 3.4 mol of photons with a frequency of 2.3 1014 Hz?
_____________J
How much energy resides in 0.76 mol of the same photons?
_____________J
Soccer Mom
(Cramster SME)
posted by obama on 10/16/2008 8:18:54 AM  |  status: Live
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Response Details:
 
      5.3 x 10 2  nm  coressponds to GREEN light  in visible region   of electromagnetic specrum.
    
     For any electromagnetic wave , frequency,υ  =  velocity of light,c  /  wave length of electromagnetic wave,λ
  ( c = 2.98 x 10 8 m/ sec,  λ  = 5.3 x 10 2 nm   =  5.3 x 10 2 x 10 -9 m  =  5.3 x 10 -7 m  ). Hence
                                                           
                                                 υ = ( 2.98 x 10 8 m/sec  ) / ( 5.3x 10 -7 m)
                                                     =    0.5623 x 10 15 / sec
                                                     = 0.5623 x 10 15 hertz.
 the energy of  this wave ,E  =   planks constant,h  x frequency of wave,v
                                           =  6.625 x 10 -34 J sec  x 0.5623 x 10 15  / sec
                                          = 3.7252 x 10 -14   J
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