問題詳情
9. The focal length of a camera lens is 20.0 cm. How far from the lens should the subject for the photo be if the lens is 20.5 cmfrom the film?
(A)8.20 m
(B)4.10 m
(C) 2.10 m
(D) 6.30 m
(E) 10.0 m
(A)8.20 m
(B)4.10 m
(C) 2.10 m
(D) 6.30 m
(E) 10.0 m
參考答案
無參考答案
內容推薦
- The density of ice is 0.920 g/cm3 while that of sea water is 025 g/cmWhat fraction of an ice
- ( ) 有兩個相等的正電荷(以Q表示)其距離為r時，他們之間相互作用力的大小以F表示。假設距離不變，而改變其電性或電量，則下列哪一個靜電力圖是對的？(A) (B) (C) (D)
- ( )下列關於摩擦力之敘述，何者錯誤？ (A)最大靜摩擦力與兩物體間之接觸面積大小有關 (B)摩擦力與兩接觸面間之正向力有關 (C)摩擦力與接觸面之光滑程度有關 (D)摩擦力與接觸面之溼潤程度有
- ( )遊樂區的鬼屋內部，不僅光線微弱，而且牆壁都被塗成何種顏色其反射效果最差，更增添恐怖的效果？(A)黑色 (B)藍色 (C)綠色 (D)紅色
- A series RLC circuit, driven with a sinusoidal external emf with rms voltage 120 V, contains a re
- ( )小余的爸爸是遠洋漁船的船長，所以小余對漁船的構造非常有興趣，爸爸告訴小余，漁船都是用聲納探測魚群的所在，如果沒有聲納就很難在遼闊的海洋裡找到魚群。假設海水中聲音傳播的速率為1000公尺╱秒
- ( )小晴將耳朵貼在無火車行駛的觀光用鐵軌上，小雨由鐵軌的另外一端敲擊鐵軌。小晴共聽到兩次聲音，第一次由鐵軌傳來，第二次由空氣傳來，若兩次聲音的間隔相差3秒，且小晴與小雨的距離為2720公尺，則
- ( )小新站在直立的平面鏡前 6 公尺處，當小新向平面鏡移近 3 公尺時，下列敘述何者正確？(A)像離開鏡，後退 3 公尺 (B)小新與像的距離縮短 6 公尺 (C)小新與像的距離不變 (D)像
- Regarding the reactions of organic compounds, which of the following statements is NOT true?(一律送
- ( )音叉振動頻率為f1赫，發出聲音之頻率為f2赫，50公尺處測得此聲音的頻率為f3赫，則fff3之大小關係為何？(A) f1＝f2＝f3 (B)f2＞f3＞f1 (C)f3＞f2＞f1
內容推薦
- The angular velocity vector of a spinning body points out of the page. If the angular accelerati
- A block whose mass m is 650 g is fastened to a spring whose spring constant k is 65 N/m. The blo
- ( )進行「力的測量」實驗時，施加於彈簧的力F與彈簧伸長量X的關係，如圖所示，下列敘述何者正確？ (A)伸長量X與受力F不成正比，不能用來測力的大小 (B)當施力介於20～60公克重時，才可用此
- ( )有一艘海底探測船，若以等速向西行駛，每隔一段時間利用聲納探測海底深度一次，其回聲接收時間依序為20 秒、30 秒、40 秒、30 秒、5 秒、20 秒，則海底地形應為下列何者？ (A)
- A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a forceas
- Which of the following statements is true about the following electrochemical cell?(A) The cell
- Which of the following statements are true? A catalyst can act in chemical reaction to: I. Lower
- ( )一U形管內，裝有甲、乙、丙三種互不相溶的液體，平衡時如圖所示，其中甲液柱長度與丙液長度相等，d點為丙液柱的中間點，則液中各點的壓力大小關係，何者正確？ (A) e＝f (B) c＝d (C
- 設X、Y、Z分別代表三種相異之元素，對以下之均衡化學反應式：XZ2 ＋ 4Y → 2甲 ＋ X而言，依據道耳吞之原子說，甲的化學式為下列何者？(A) YZ (B) YZ(C)Y2Z (D)
- Examine the phase diagram for the substance Bogusium (Bo) and select the correct statement. (A)
- The structure below is the repeating unit of a (A) homopolymer formed by an addition reaction. (
- The inertia of a body tends to cause the body to:(A) speed up (B) slow down (C) resist any chang
- A thin-walled hollow tube rolls without sliding along the floor. The ratio of its translational
- 在下列四種條件下進行雙氧水分解實驗，請問 何者產生氣泡的速率最快？ (A) (B) (C) (D)
- Two stationary tuning forks (350 and 352 Hz) are struck simultaneously. The resulting sound is o
- Adipic acid contains 32% C, 84% O, and 85% H by mass. What is the empirical formula?(A)
- A 0.20 M solution of MgSO4 has an observed osmotic pressure of 0 atm at 25°C. Determine the ob
- When the following equation C2H5OH + O2⇌ CO2 + H2O is balanced, what are the coefficients?(A) 2,
- On a new temperature scale (°L), water boils at 100°L and freezes at –00°L. Calculate the
- To form a buffer solution with pH = 0, how many moles of NH4Cl should be added to 0 L of 0.2
- Which statement about hydrogen bonding is true?(A) Hydrogen bonding is the intermolecular attrac
- An electron is promoted from the π to the π∗ molecular orbital in an O2 molecule following the a
- Determine the percent dissociation of a 0.18 M solution of hypochlorous acid, HClO. The Ka for t
- The solubility of CaSO4 in pure water at 0 oC is 14 gram per liter. The value of the solubilit
- 有關原子量的敘述，下列何者正確？(A)原子量是分子之間質量的相互比較值(B)原子量有單位，單位是(C)國際上以氫－12當作標準(D)若碳的原子量改為36，則其他原子的原子量皆會變大