33. A magnetron in a microwave oven emits electromagnetic waves with frequency f = 2450 MHz. Which of the following values in Gauss is closest to the magnetic field strength required for electrons to move in circular paths with this frequency?
(A) 5
(B) 50
(C) 200
(D) 600
(E) 900

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統計： A(1), B(1), C(0), D(1), E(3) #2993332