Ec=h*c/Lc Ek=h*c/Lk Ec/Ek=Lk/Lc=720/480=1,5 Ответ в)
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Ec=h*c/Lc Ek=h*c/Lk Ec/Ek=Lk/Lc=720/480=1,5 Ответ в)