IB物理考試包括3個(gè)paper，paper1是選擇題，paper2和paper3是簡(jiǎn)答題，其中不管是SL還是HL，Paper2都是占分?jǐn)?shù)比例最大的，所以大家一定要重視這部分考試，今天留求藝留學(xué)為大家總結(jié)了IB物理HL Paper2真題示例及備考技巧，希望對(duì)大家有幫助。

IB物理HL Paper2真題示例

1.) The air in a kitchen has a pressure of 1.20 x 105?Pa and a temperature of 23 C. There is a refrigerator inside the kitchen with an internal volume of 0.38 m3.

a.)?When the refrigerator door is open, the temperature and pressure of the air inside the kitchen and inside the refrigerator are the same. Calculate the number of air molecules in the refrigerator.

Answer
PV = nRT
N = PV / RT
N = (1.20 x 105?x 0.38) / ((273 + 23 ) x 8.314 = 18.529 = 18.5 mol
Number of molecules = 18.5 x 6.023 x 1023?= 1.1 x 1025

b.) When the refrigerator door is closed, the temperature inside cools down to 4 C with the same amount of air molecules.

i.) Determine the pressure of the air inside the refrigerator round to 3 significant figures

Answer
P1T1?= P2T2
1.2 x 105?x (273+23) = P2 x (273+4)
P2 = (1.20 x 105?x (273+23)) / (273+4)
P2 = 128231.0469 → (1.28 x 105?Pa)

ii.) The area of the door of the refrigerator is 0.75 m2. Determine the minimum force needed to open the refrigerator door.

Answer
Force = Difference in pressure x Area
Force = (128231 – 120000) x 0.75 = 6173.25 = 6.17 kN

2.) A closed box has a fixed volume of 0.21m3?and contains 4 mol of ideal monatomic gas. The temperature of the gas is 294 K.

i.) Calculate the pressure of the gas
Answer
PV = nRT
P = nRT / V
P = (4 x 8.3145 x 294) / 0.21 = 46561.2 Pa = 46.5 kPa

b.) When the gas is supplied with 0.81 kJ of energy, the temperature of the gas increases by 25 K. The specific heat capacity of the gas is 3.1 kJ / kgK

i.) Calculate the mass of the gas in kg

Answer
Q = mcΔT
M = Q / cΔT
M = 0.81 / (3.1 x 25) = 0.0104516 kg = 0.0105 kg

ii.) Determine the total kinetic energy of the gas particles in kJ

Answer
Average kinetic energy = 3/2 kB T
Avg KE = 3/2 (1.38 x 10-23) x 319 = 6.6033 x 10-21
Number of molecules = 4 x 6.023 x 1023?= 2.4092×1024
Total kinetic energy = 6.6033 x 10-21?x 2.4092×1024?= 15908.67036 J = 16 kJ

IB物理HL Paper2備考技巧

●P2其實(shí)是所有paper里最難的，因?yàn)榭嫉锰貏e靈活，運(yùn)算也多，通常會(huì)用到several steps和一個(gè)以上的公式。

●P2考驗(yàn)同學(xué)們對(duì)知識(shí)點(diǎn)掌握的靈活度和熟練度，同時(shí)還有許多要用到Common Sense的地方，雖然說(shuō)很多時(shí)候考完P(guān)1已經(jīng)沒(méi)有了。

●P2需要同學(xué)們對(duì)每一個(gè)知識(shí)點(diǎn)透徹的理解，所以在學(xué)新知識(shí)點(diǎn)的時(shí)候一定不要學(xué)得似懂非懂，必須全部理解才行。

●同樣地，P2也可以用多刷題來(lái)解決，不過(guò)可以刷題的時(shí)候根據(jù)topic來(lái)給不同類型的題分類，比如Wave這個(gè)topic里WaveInterference會(huì)考的題有哪些類型，Simple Harmonic Motion會(huì)考的又有哪些類型，最后會(huì)發(fā)現(xiàn)IB很多題本質(zhì)上都相似，萬(wàn)變不離其宗。

●掌握了一類題的解決方法，不管它怎么變形，核心都是一樣的，這樣考試遇到什么題都不怕啦。記得一個(gè)大題的每道小題之間是相互關(guān)聯(lián)的，要是有一個(gè)小題不知道怎么做，可以聯(lián)系其他小題看能不能得到什么信息。

2023年5月考試愈近，現(xiàn)在正是IBDP2學(xué)生忙于復(fù)習(xí)備考的關(guān)鍵階段！復(fù)習(xí)備考，多做IB歷年真題很有必要！如果大家有需要IB考試輔導(dǎo)的小伙伴，可以直接在線咨詢哦~

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