2013CAP Prize Exam加拿大高中物理大獎賽真題答案下載

歷年CAP High School Prize Exam加拿大高中物理大獎賽

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2013 CAP Prize Exam完整版真題免費下載

共計3小時考試時間

此套試卷由25道選擇題以及3道大題組成

每道大題含有不同數量的小題

2013CAP Prize Exam加拿大物理奧林匹克完整版答案免費下載

部分真題答案預覽：

Part A選擇題部分：

1. A
2. C
3. A
4. A
5. A

Part B簡答題部分

Solution to Problem 1：

The internal resistance of the capacitor is small compared with the dynamic resistance of the diode at the operating current, so it can be ignored.

Q(t)/C+ R(t)I + VLED =0

I = I0 is to be kept constant at 800 mA, so

Q(t)= Q0 ? I0 t

... where Q0 is the initial charge.

Q0 = V0 C (Q0 ? I0 t)/C? R(t)I0 ? VLED =0 V0 ? I0 t/C ? R(t)I0 ? VLED =0 V0 /I0 ? t/C ? R(t)? VLED/I0 =0 R(t)= ?t/C ? VLED/I0 + V0 /I0

Therefore R0 has to be R0 =(V0 ? VLED)/I0 =(5? 2.7)/0.5=2.9Ω

R(t)= ?t/C + R0 = R0 ? t/C

R(t)cannot be negative, so tmax = R0 C =3000× 2.9 =8600 s,thatis2.4hours.

完整版真題資料可以底部二維碼免費領取↓↓↓

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