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**1. The problem statement, all variables and given/known data**

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.

**2. Relevant 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 dont know how to get the period from the frequency then, well sadly you shouldnt be helping me lol :)!

**3. 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 dont 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 dont believe im wrong but please enlighten me if I am. Thank you!!

**1. The problem statement, all variables and given/known data**

**2. Relevant equations**

**3. The attempt at a solution**