36. 當一電磁波通過空間中某一點時,其電場隨時間變化為 E=E0 sin2πft,式中 E0=0.0042 V/m,求該電磁波中磁場的振幅。(A) 4.2×10-3T (B) 1.4×10-3 T(
37. 20 oC 的空氣中氮分子的均方根速率(vrms)為 517 m/s,若空氣溫度提高至 82 oC,氮分子的 vrms變為多少?(A) 427 m/s (B) 626 m/s(C) 569 m
38. 冰的熔化熱為 80 cal/g,20g 的冰塊在 0 oC 熔化為水,求熔化過程系統熵值的變化。(A) -5.86 cal/K (B) 5.86 cal/K(C) 0.29 cal/K (D)
35. If the r.m.s. value of the voltage from a standard electrical outlet in Britain is 240 volts, th
36.What is the vertical size of the smallest vertical plane mirror in which a observer, 180 cm talla
37. The wave length of yellow sodium light in air is 589 nm. What is its wave length in glass inwhic
38. A meter stick moves at 0.95 C in the direction of its length through a laboratory. According tom
39. A capacitor stores 10 C of charge with a potential difference of 40 V between its plates. Thecap
14. 聲波在空氣中的速率 vs與絕對溫度T的關係為vs 。若我們將公式近似為vs=v0(1+αt) ,其中v0為0℃ 時的聲速,而 t℃ 為攝氏溫度。α的值為(A) 1.8 ×10-2/℃(B) 3
28. 一個彈力常數為 k 的彈簧受功 W 而被拉長到某距離 d。另一個彈簧被拉長到只有一半距離 d/2 時,所需功是 2W。請問第二個彈簧的彈力常數為何?(A)2k(B)4k(C)8k(D) 16k