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Vibrating electron can emit on electromagnetic wave, the frequency of the electromagnetic wave must be equal to the vibrating frequency of electron.
Only one point of ray ab will be at exact distance of 3 cm from point a.
Internal energy of the system changes by ΔE = 178 J.
Heat given to the system = Q = +658 J.
According to the first law of thermodynamics,
ΔE = Q + W
178 = 658 + W
∴ W = 178-658 = -480 J
Minus sign indicates that work is done by the system.