# 2022年物理碗竞赛时间公布，现在应该如何备考物理碗竞赛？

2022年物理碗竞赛时间公布，下一次“物理碗”竞赛时间是在2022年3月26日。

“PhysicsBowl”——“‘物理杯’美国高中物理思维挑战”，由权威的美国物理教师协会（AAPT）主办，11个国家超过500所学校上万名选手参加，参赛者希望以此来证明自己的物理能力。

Division 1适合高一学生（IB10年级，A-level的G1年级部分优秀学生和G2年级）。
Division 2适合高二，高三学生（IB11-12年级，A-level年级）。

8.) A candle, a converging lens and a white screen are placed in a line with the lens between the candle and the screen. A distance of 72 cm separates the candle and screen. As the lens is moved to all points between the candle and the screen, only one focused image of the candle can be made on the screen. What is the focal length of the converging lens?
(A) 12 cm (B) 18 cm (C) 24 cm (D) 36 cm (E) It cannot be determined without knowing the location of the lens when the focused image is produced.
35.) In a mixture of hydrogen, oxygen, and nitrogen gases at room temperature, the molecules having the greatest average speed are those of (A) Hydrogen (B) Oxygen (C) Nitrogen (D) All have the same speed (E) It depends upon the composition of the mixture
Here are some various example questions from the Division III exam, some of which include equations or constants:
44.) Consider a traveling wave on a string of length L, mass M, and tension T. A standing wave is set up. Which of the following is true?
(A) The wave velocity depends on M, L, T. (B) The wavelength of the wave is proportional to the frequency. (C) The velocity of a given particle in the string is equal to the wave velocity. (D) The wavelength is proportional to T. (E) The frequency depends upon L.
49.) A lump of clay whose rest mass is 4.0 kg is traveling at three-fifths of the speed of light when it collides head-on with an identical lump going in the opposite direction at the same speed. If the two lumps stick together and no energy is radiated away, what is the mass of the composite lump?
(A) 4.0 kg (B) 6.4 kg (C) 8.0 kg (D) 10.0 kg (E) 13.3 kg