7. One surface is remained at temperature of 300 K and it’s heat current in radiation is H. When it was heated to 600 K, what is the
heat current in radiation of this surface comparing to that at 300 K?
(A) 32H
(B) 16H
(C) 8H
(D) 4H
(E) 2H
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統計: A(0), B(44), C(2), D(5), E(8) #2356583
統計: A(0), B(44), C(2), D(5), E(8) #2356583