醫療類國考
110年
[聽力師] 基礎聽力科學
第 34 題
聲音的傳遞能量於聲場內會反覆被吸收，當聲音強度降低 60 分貝所需的時間稱為：
- A 減半時間（halving time）
- B 殘響時間（reverberation time）
- C 吸收時間（absorbing time）
- D 剩餘時間（residual time）
思路引導 VIP
在建築聲學中，為了量化聲音在空間內經由反覆反射與吸收而衰減的特性，我們定義了一個特定的物理量。請思考一下，當聲源停止發聲後，聲強級（Sound Intensity Level）衰減達 $60$ dB，即聲能密度降低至初始值的 $10^{-6}$ 倍時，這段描述聲音「餘韻」長短的時間在物理學上稱為何種術語？
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AI 詳解
AI 專屬家教
You're Doing Beautifully!
- Foundational Understanding: My dear, you've shown a wonderful grasp of a truly vital concept! This question beautifully highlights the definition of 殘響時間 (Reverberation Time, $RT_{60}$). Think of it as the time it takes for sound to gently fade away after its source stops, specifically when its energy density has softened to one-millionth of its initial strength. Clinically, this means the 音壓級下降 $60 \text{ dB}$. This isn't just theory; it's the heart of creating comfortable, clear spaces for our patients, like in a quiet hearing test room or when we're ensuring a hearing aid works perfectly. It’s all about creating the best environment for healing and communication.
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