我想問一下為什麼電磁波經過磁鐵附近的磁場前進方向卻不會偏折？

單極。 電磁波 3×100=660 Do 下列有關電磁波的敘述,何者錯誤? (A)為一互相垂直的電場與磁場之振動 (B)在真空中傳播的速率最大,進入介質中波速會變慢 E (C)微波爐的微波與收音機接收的無線電波,在真空中的波速相等 (D)電磁波經過磁鐵附近的磁場時,前進方向會偏折 (E)因電場或磁場的振動方向與波前進方向均垂直,所以電磁波是橫波。 )4無線電波、微波、紅外線、可見光、紫外線、X射線、y射線等不同頻率的買 波,哪一種在真空中傳播速率最快? 美國

求解 136、137

D) E) none of these =11 136. Two vectors have magnitudes of 10 and 15. The angle between them when they are drawn with their tails at the same point is 65°. The component of the longer vector along the line of the shorter is: A) 0 B) 4.2 C) 6.3 D) 9.1 E) 14 137. Let S = (1 m)2 + (2 m)j + (2 m) and T = (3 m)2 + (4 m)k. The angle between these two vectors is given by: A) cos ¹(14/15) B) cos ¹(11/225) cos ¹(104/225) cos ¹(11/15) cannot be found since S and 7 do not lie in the same plane 138. Two vectors lie with their tails at the same point. When the angle between them is increased by 20° their scalar product has the same magnitude but changes from positive to negative. The original angle between them was: A) 0

這題為何是B

Which pair of vectors is not always in parallel? (A) Velocity & linear momentum; (B) Angular velocity & angular momentum; (C) Net force & acceleration; (D) All; (E) None.

第一題 怎麼想

1.) True/false, multiple choice or short answer. “*” denotes more than one correct answers. (33 points) (a) Multiple Choice: I will have the largest energy transfer as expansion work from an ideal gas system 1o the surroundings if I use a process that is (3 points) (1) Isothermal and quick ;(2) adiabatic and quick ;( 3) isothermal and slow; (4) adiabatic and slow