Fundemental Frequency units?

  • #1

Homework Statement


The fundamental vibrational frequency of gaseous 14N16O is 1904 cm-1.

a. Calculate the force constant, using the simple harmonic oscillator model


Homework Equations



K=u((2pi)(v))^2 u=reduced mass

The Attempt at a Solution



u=[(14)(16)/(30)] (1kg/6.02e^26)= 1.24e^-26 Kg/molecules

K=(1.24e^-26 kg)((2pi)(1904 cm^-1))^2= 1.77e^-22 kg m^2

How do I get the answer in N/m ??
 

Answers and Replies

  • #2
Matterwave
Science Advisor
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What does it mean when there is a frequency given in cm-1? Frequency should be given in Hz (or per time of some sort). Perhaps instead of "fundamental frequency" they meant "wave number/vector"?
 
  • #3
cm^-1 is the wavenumber.
 
  • #4
Matterwave
Science Advisor
Gold Member
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If you have K = u(2pi*v) why are you plugging in your wave number for v? v is a frequency yes? So how do you convert a wave number into frequency?
 
  • #5
Ok...

Good point, I will change wave number to frequency.
 

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