阿摩線上測驗
20. The figure is a plot of stopping voltage Vstop versus light frequency f in a photoelectric experiment with a certain metal. What happens to the plotted line if we switch to a metal with a smaller work function?
(A) plot's slope increases, but horizontal intercept remains the same,
(B) plot's slope decreases, but horizontal intercept remains the same,
(C) plot shifts rightward and slope increases,
(D) plot shifts leftward, with no change in slope,
(E) there is no change in the plot.
(A) plot's slope increases, but horizontal intercept remains the same,
(B) plot's slope decreases, but horizontal intercept remains the same,
(C) plot shifts rightward and slope increases,
(D) plot shifts leftward, with no change in slope,
(E) there is no change in the plot.
答案：登入後查看
統計： A(0), B(0), C(0), D(1), E(0) #3332079
統計： A(0), B(0), C(0), D(1), E(0) #3332079
詳解 (共 2 筆)
助人為本
#7399645
所以解這題要想到愛因斯坦的光電方程式
光電方程式是基於能量守恆
光子能量=功函數+電子飛出去的動能
把它和數學的方程式比較
題目說換成功函數較小的金屬
而這條線的斜率為h/e，所以不管換成甚麼金屬，斜率都不變
再來第二步看截距
ㅤㅤ
所以綜合以上兩點，斜率不變，線往左邊移動{截距變小)
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