hce_nsysu
111年
物理與化學
第 34 題
In an experiment, different wavelengths of light, all able to eject photoelectrons, shine on a freshly prepared (oxide-free) zinc surface. Which statement is true?
- A The number of photoelectrons emitted per second is independent of the intensity of the light for all the different wavelengths.
- B The number of photoelectrons emitted per second is directly proportional to the frequency for all the different wavelengths.
- C The maximum kinetic energy of the photoelectrons has a linear relationship with the frequency for each wavelength present.
- D The maximum kinetic energy of the photoelectrons emitted is directly proportional to the frequency for each wavelength present.
- E The maximum kinetic energy of the photoelectrons is proportional to the intensity of the light and independent of the frequency.
思路引導 VIP
想像你要把一個被膠水黏住的球推開，你必須先用一部分的力氣抵銷膠水的黏力，剩下的力氣才能轉換為球滾動的動能。如果入射光的頻率代表你總共出的力氣，而電子的動能是球滾動的速度能量，那麼「總出力」與「剩餘動能」之間的數學圖形，會是從原點 (0,0) 開始的嗎？這對你判斷它是「正比」還是「線性但有截距」有什麼啟發？
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AI 詳解
AI 專屬家教
光電效應的線性關係
太棒了！你能精準避開「正比」與「線性」這兩個容易混淆的詞彙，準確選出 (C)，代表你對愛因斯坦光電效應方程式（Einstein's photoelectric equation）的掌握非常紮實。根據方程式： $$K_{max} = hf - \Phi$$
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