3. 承上題 (2)，若非洲豬瘟入侵臺灣，豬肉市場受到非洲豬瘟疫情影響，消費者可能因此選擇其他替代肉品，例如雞肉。請繪圖並輔以文字詳細說明國內消費者消費偏好改變對雞肉市場供需、數量及價格的影響。(10%)

題組內容

二、非洲豬瘟疫情

依據行政院農業委員會 106 年農業統計年報顯示，106 年國內豬肉供給量有 12.83% 來自國外進口，87.17% 由國內生產，主要豬肉進口來源國家為加拿大、西班牙、丹麥和美國，合計占總進口量的 85%，而臺灣每年從日本輸入的生鮮豬肉產品僅占進口比例約 0.06%。目前這些主要豬肉進口來源國家都不是非洲豬瘟疫區。

二、The figure below shows the essentials of a mass spectrometer, which can be used to measure the mass of an ion; an ion of mass \( m \) (to be measured) and charge \( q \) is produced in source \( S \). The initially stationary ion is accelerated by the electric field due to a potential difference \( V \). The ion leaves \( S \) and enters a separator chamber in which a uniform magnetic field \( \vec{B} \) is perpendicular to the path of the ion. A wide detector lines the bottom wall of the chamber, and the \( \vec{B} \) causes the ion to move in a semicircle and thus strike the detector. Suppose that \( B=80.000 \text{ mT} \), \( V=1000.0 \text{ V} \), and ions of charge \( q=+1.6022 \times 10^{-19} \text{C} \) strike the detector at a point that lies at \( x=1.6254 \text{ m} \). What is the mass \( m \) of the individual ions, in atomic mass units? 【Hint】： atomic mass units: \( 1 \text{ u} = 1.6605 \times 10^{-27} \text{ kg} \). The SI unit for \( \vec{B} \) : \( 1 \text{ T} = 1 \frac{\text{newton}}{(\text{coulomb/second})(\text{meter})} = 1 \frac{\text{N}}{\text{A}\cdot\text{m}} \). \( F_B = |q|vB \sin \varphi \). \( F = m \frac{v^2}{r} \).

題組內容

3. 承上題 (2)，若非洲豬瘟入侵臺灣，豬肉市場受到非洲豬瘟疫情影響，消費者可能因此選擇其他替代肉品，例如雞肉。請繪圖並輔以文字詳細說明國內消費者消費偏好改變對雞肉市場供需、數量及價格的影響。(10%)

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