問題詳情
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 magneticfield strength required for electrons to move in circular paths with this frequency?
(A) 5
(B) 50
(C) 200
(D) 600
(E) 900
參考答案
答案：E
難度：計算中-1
書單：沒有書單，新增