Asian Physics Olympiad: 1st-8th, Problems and Solutions by Zheng Yongling

By Zheng Yongling

This booklet compiles the entire try out difficulties and strategies from the first during the eighth Asian Physics Olympiad. attempt questions of each paper encompass components, a thought part and an scan part, prior to which mins of groups and result of each one pageant are brought. it's a quite fascinating reference publication for either scholars and academics of foreign pageant education in addition to heart tuition pupil contestants.

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2 - 6. 2-6. Scattered electron waves from different rows of atoms must interfere constructively if diffracted electrons are to be observable. l = b(sin - sin 0) = nA. 47 The Second Asian Physics Olympiad Given

7 days. is proportional to 1/ r6, we conclude r6 r (6) constant. 2-3. r Let the current values of rand be, respectively, ro and n,. From Eq. =r. (8) By Newton's law of action and reaction or by the law of conservation of the total angular momentum, - r is equal to the rate of change of the total orbital angular momentum L of the Earth-Moon system so that dL cit =-r. (9) But according to Eq. (3), we have and Eq. 1. 2 _ - MM ( G ) E ME M + 2 r + CiO) 3S The Second Asian Physics Olympiad This implies -1.

77 A, the following two solutions are possible. CD When n = 0,

1 . (2) WehaveI= Ioexp(-(u. f:J()2). For elastically scattered electrons, the wavelengths K' before and after scattering must be equal so that K' = K. Therefore, for the specularly reflected beam, the triangle in Fig.

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