Jawabanmu

2014-01-17T22:14:38+07:00
1000 watt = memancarkan 1000 joule tiap detiknya

1000 = n . 6,63 x 10^-34 . 5 x 10^20
1000 = n . (100/3) x 10^-14
n = 1000/(100/3) x 10^-14
n = 30 x 10^14 = 3 x 10^15

Energi 1 foton = 1000/(3 x 10^15) = (1/3) x 10^12 J

Mohon koreksi jika salah :)
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