Hi shivani
The average energy of an oscillator at frequency 5.6*10^12 per sec at T=330k is calculated using the formula:
E=kT
Where, E is the average energy
k is Boltzmann constant that is 1.380*10^-23
T is the temperature
So, after calculation you should get the answer:
4.554*10^-21 Joules
Hope it helps.
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