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1.下列关于电磁波的说法,正确的是(C)A.电磁波只能在真空中传播(教科版选修3-4P51页)B.电场随时间变化时一定产生电磁波(教科版选修3-4P49页)C.做变速运动的电荷会在空间产生电磁波(教科版选修3-4P50页)(知识延伸:麦克斯韦的电磁理论告诉我们:运动电荷只有处在外加电场中才会辐射或吸收电磁波,并且只要运动电荷处在外加电场中,无论电荷是作匀速运动还是加速运动都可能辐射或吸收电磁波;但电荷
1. The following on the electromagnetic wave, the correct is (C) A. Electromagnetic waves can only be transmitted in a vacuum (Elective 3-4P51 textbook) B. Electric field will produce electromagnetic waves over time (Elective 3-4P49 C. Doing Charges with Variable Speed Movements Will Generate Electromagnetic Waves in Space (Elective 3-4P50) (Extended Knowledge: Maxwell’s Electromagnetic Theory tells us that a moving charge radiates or absorbs electromagnetic waves only in an applied electric field, The motion charge is in the applied electric field, and the electromagnetic wave may be radiated or absorbed regardless of whether the charge is moving at a uniform speed or accelerating. However, the charge