- #1
The CdePster
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Homework Statement
In a simple atomic model of a solid, the atoms vibrate with a frequency of 2E-11 Hz. The amplitude of the vibration of the atoms is 5.5E-10 m and the mass of each atom is 4.8E-26. Calculate the total energy of the oscillations of an atom.
Homework Equations
total energy= 0.5(mass)(angular frequency)^2 x max displacement
not forgetting angular frequency= 2pi/the period
Other information is easy and if you don't know how to get the period from the frequency then, well sadly you shouldn't be helping me lol :)!
The Attempt at a Solution
I solved it, its very easy you just plug in the numbers really however the answer given is 1.2E-20. I don't get this, I used the equation I gave you and also the easier equations like E=0.5kx^2 after finding the spring constant of the atoms from the equation T= 2pi root(m/k)
and I get the same answer either way which is 2.1E-11 J.
I don't believe I am wrong but please enlighten me if I am. Thank you!