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suwarna07
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Homework Statement
Atoms in a solid are not stationary, but vibrate about their equilibrium positions. Typically, the frequency of vibration is about f = 2 E12 Hz and the amplitude is about 1.1 E-11m. For a typical atom, what is its (a) maximum speed?
Homework Equations
T= 1/f.
v = change in displacement/ change in time
The Attempt at a Solution
I found the period which is 1/f. For T i got 5 E -13.
We know the maximum speed is at its equilibrium position.
So, to find the time taken from the highest point (A) to equilibrium point, I divided T/4 which is 1.25 E -13.
Finally, to find velocity I divided 1.25 E-13 (change in time) by 1.1 E-11 (change in displacement or Amplitude) and i got 88 m/s.
BUT the correct answer is 140 m/s.
Can someone tell me what did i do wrong in here? AND this is non-calculus based physics course.