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    1. IYPT2019中國隊再次蟬聯金牌!


      201976-713日,第32屆國際青年物理學家錦標賽(International Young Physicists’ Tournament, IYPT)在波蘭華沙成功舉行。我校高三(4)班王涵悅,高三(5)班劉天翼同學入選中國代表隊,與來自中國人民大學附屬中學、北師大附屬實驗中學國際部和深圳中學的其他3位中國選手共同奮戰,發揮穩定。經過5輪比拼,中國隊保持單場總分第一,順利晉級決賽,再次蟬聯團體金牌。






      1. Invent Yourself

      Design an instrument for measuring current using its heating effect. What are the accuracy, precision and limits of the method?

      2.Inconspicuous Bottle

      Put a lit candle behind a bottle. If you blow on the bottle from the opposite side, the candle may go out, as if the bottle was not there at all. Explain the phenomenon.

      3.Swinging Sound Tube

      A Sound Tube is a toy, consisting of a corrugated plastic tube, that you can spin around to produce sounds. Study the characteristics of the sounds produced by such toys, and how they are affected by the relevant parameters.

      4.Singing Ferrite

      Insert a ferrite rod into a coil fed from a signal generator. At some frequencies the rod begins to produce a sound. Investigate the phenomenon.

      5.Sweet Mirage

      Fata Morgana is the name given to a particular form of mirage. A similar effect can be produced by shining a laser through a fluid with a refractive index gradient. Investigate the phenomenon.

      6.Saxon Bowl

      A bowl with a hole in its base will sink when placed in water. The Saxons used this device for timing purposes. Investigate the parameters that determine the time of sinking.

      7.Balls on a String

      Put a string through a ball with a hole in it such that the ball can move freely along the string. When you move the free end periodically, you can observe complex movements of the two balls. Investigate the phenomenon.

      8.Soap Membrane Filter

      A heavy particle may fall through a horizontal soap film without rupturing it. However, a light particle may not penetrate the film and may remain on its surface. Investigate the properties of such a membrane filter.

      9.Magnetic Levitation

      Under certain circumstances, the “flea” of a magnetic stirrer can rise up and levitate stably in a viscous fluid during stirring. Investigate the origins of the dynamic stabilization of the “flea” and how it depends on the relevant parameters.

      10.Conducting Lines

      A line drawn with a pencil on paper can be electrically conducting. Investigate the characteristics of the conducting line.

      11.Difting Speckles

      Shine a laser beam onto a dark surface. A granular pattern can be seen inside the spot. When the pattern is observed by a camera or the eye, that is moving slowly, the pattern seems to drift relative to the surface. Explain the phenomenon and investigate how the drift depends on relevant parameters.

      12.Polygon Vortex

      A stationary cylindrical vessel containing a rotating plate near the bottle surface is partially filled with liquid. Under certain conditions, the shape of the liquid surface becomes polygon-like. Explain this phenomenon and investigate the dependence on the relevant parameters.

      13.Friction Oscillator

      A massive object is placed onto two identical parallel horizontal cylinders. The two cylinders each rotate with the same angular velocity, but in opposite directions. Investigate how the motion of the object on the cylinders depends on the relevant parameters.

      14.Falling Tower

      Identical discs are stacked one on top of another to form a freestanding tower. The bottom dics can be removed by applying a sudden horizontal force such that the rest of the tower will drop down onto the surface and the tower remains standing. Investigate the phenomenon and determine the conditions that allow the tower to remain standing.

      15.Pepper Pot

      If you take a salt or pepper pot and just shake it, the contents will pour out relatively slowly. However, if an object is rubbed along the bottom of the pot, then the rate of pouring can increase dramatically. Explain this phenomenon and investigate how the rate depends on the relevant parameters.

      16.Nitinol Engine

      Place a nitinol wire loop around two pulleys with their axes located at some distance from each other. If one of the pulleys is immersed into hot water, the wire tends to straighten, causing a rotation of the pulleys. Investigate the properties of such an engine.

      17.Playing Card

      A standard playing card can travel a very long distance provided that spin is imparted as it is thrown. Investigate the parameters that affect the distance and the trajectory.




      第一輪由于反方的失誤,我們隊并沒有獲得理想的分數,排名也罕見地排在十名之外。從第二輪開始分數穩步回升,其中張哲倫學長的科幻之聲和我的醬油光學均獲得了7.13分;學長在面對評委提問公式的來源時所說的“I derived all the equations by myself, I have no references”震驚四座,被全隊奉為經典。王涵悅同學的反方和評論方也獲得高達8分的得分,甚至有評委打出10分。賀昕妍同學穩定的反評得分保證了隊伍排名的穩定上升。這些得分使中國隊在第五輪之前位居第四。第五輪自選我成功展示了循環擺并獲得7.63分,這使我在波蘭基本沒有留下遺憾。


      波蘭的IYPT比賽帶給我很多新的體驗;首先相對于國內的YPT比賽,國際賽事更重視對基本物理原理的理解,即在正方報告中要將發生這一現象的物理過程講解清楚;易于理解的展示和清晰的表達會促使評委們傾向于打高分。相比之下,帶有多個積分或求和符號的冗長公式就不那么受到青睞。這直接導致隊伍中物理水平最高的張哲倫學長決賽的自選正方沒有獲得理想的分數;評委認為學長的題缺少“own contribution”:他們認為正方的公式全部來源于文獻,缺乏對這道題自己的貢獻。而事實上那道題大部分的公式都是學長自己推的,而評委顯然沒有相信。




      供稿人:青年物理學家社 王涵悅 劉天翼