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P. 4042. A filament lamp rated at 40 W transforms 2% of the total energy to visible light. Suppose that the time of the emission of one photon is 10^{-14} second. Find the average number of visible photons emitted by the filament at the same time.

(4 points)

Deadline expired.

Statistics on problem P. 4042. 85 students sent a solution. 4 points:56 students. 3 points:12 students. 2 points:5 students. 1 point:9 students. Unfair, not evaluated:3 solutions.