A-LEVEL A2 物理复习资料 particle physicsA-LEVEL A2 物理复习资料 particle physics.docVIP

Section3 particle physics The nuclear atom Mass number and atomic number Alpha particle scattering experiment Electrons are accelerated by E and B Write equations using standard nuclear notating (5)Explain why high energies are required to break particles into their constituents and to investigate fine structure (6) de Broglie wavelength λ=h/p (201306R-7)The de Broglie wavelength associated with electrons moving at 2.5 × 106 m s–1 is A .2.9 × 10–4m B .2.4 × 10–8 m C .2.9 × 10–10m D .2.4 × 10–39m (201306-10) The de Broglie wavelength for neutrons used to study crystal structure is 1.2 nm. mass of a neutron = 1.67 × 10–27kg The speed of these neutrons would be A .3.0 × 106 m s–1 B.3.3 × 102m s–1 C.3.0 × 10–3m s–1 D.3.3 × 10–7m s–1 (201306R-8 )Which of the following is not a valid conclusion from Rutherford’s alpha particle scattering experiment? A .The atom is mainly empty space. B .The mass of the atom is mostly concentrated in the nucleus. C. The nucleus must be positively charged. D .The nucleus must be very small compared to the atom. (201306R-9) Select the row in the table that correctly identifies the composition of a 23592U+ ion. Number of protons Number of neutrons Number of electrons A 92 143 91 B 92 143 92 C 92 235 91 D 93 235 92 (201306-1)The nucleus of one of the isotopes of nickel is represented by 6028Ni. Which line correctly identifies a neutral atom of this isotope? Number of protons Number of neutrons Number of electrons A 28 32 28 B 28 32 32 C 28 60 28 D 60 28 28 （201201-10） The de Broglie wavelength of a moving tennis ball is calculated as 1 × 10-33 m. This means that the moving tennis ball A .diffracts through a narrow slit. B.does not behave as a particle. C.does not display wave properties. D.is travelling at the speed of light. (201306R-10) .A transmission electron microscope passes a beam of electrons through a tiny specimen to form an image on a viewing screen Due to the wave nature