1. (5 Points) Which statement is NOT true? A. The classical mechanics failed when it was applied to particles as amall as electrons. B. Particles cannot have an arbitrarv energy, and the classical concepts of a particle and wave blend together. C. In quantum mechanics, all the properties of a system are expressed in terms of a wave function, which reveals about the location of a particle. D. The Rayleigh-Jeans equation predicts an infinite energy spectral density at short wave lengths, which is supported by the experimental measurements. E. At room temperature, the molar heat capacities of many monatomic solids are about 3R, where R is gas constant. When the measurements were conducted at much lower temperatures, it was found that the heat capacity decreased, tending to zero as the temperature approached zero. 2. (5 Points) Which statement about the photoelectric effect is true? A. The particles of electromagnetic radiation are called photons, which can have an arbitrarv energy. B. The electrons are ejected only when high intensitv radiation is ghining on the metal surfack. C. The kinetic energy of the ejected electrons increases linearly with the frequency of the incident radiation. It is only true at high intensitv radiation. D. The work function is a characteristic property of the metal, which means the energy needed to remove an electron from the metal. E. Even at low radiation intensities, electrons are ejected immediately if the frequency is lower than the threahold value. 3. (5 Points) Which of the statement is true about the atomic structure? A. The Li2 has an atomic number larger than 1 , which is not a hydrogenic atom. B. Each atomic orbital is defined by princiole quantum number n and orbital angular momentum quantum number l. C. The orbitals with the same value of n but different values of l are said to form a subahell of a given shell. D. All orbitals of the same shell have the game energy in all kinds of atoms. E. In a hydrogenic atom, the closer the electron is to the nucleus, the higher the potential energy and the lower the kinetic energy of the atom. 4. (5 Points) Which of the subshells below do NOT exist due to the constraints upon the angular momentum quantum number? A. 2d B. 2s C. 2p D. 3f E. 4g F. None of the above G. A, D and E