國中教甄｜理化理化109 年第 82 題單選題

When light goes from one material into another material with a higher index of refraction, \_\_\_\_\_\_.

Aits speed, wavelength, and frequency all decrease

Bits speed and wavelength decrease, but its frequency stays the same正確答案

Cits speed decreases but its wavelength and frequency both increase

Dits speed decreases but its frequency and wavelength stay the same

答案與詳解

正確答案

光進入折射率較高的介質時，速度變慢、波長變短，但頻率保持不變。

Aits speed, wavelength, and frequency all decrease✕ 易錯陷阱

光進入較高折射率介質時，速度與波長會降低，但頻率由光源決定，不會因介質改變而降低。

Bits speed and wavelength decrease, but its frequency stays the same✓ 正確

較高折射率介質中光速較小；頻率在界面兩側保持不變，因此波長隨速度下降而變小。

Cits speed decreases but its wavelength and frequency both increase✕ 錯誤

Dits speed decreases but its frequency and wavelength stay the same✕ 易錯陷阱

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