[其他] 四題
1.A positron collides head on with an electron and both are annihilated.
Each particle had a kinetic energy of 1.5MeV.What is the wavelength of
the resulting photons ?
(a) 3.09*10^-13 m (b) 6.18*10^-13 m (c) 1.24*10^-12 m
(d) 2.48*10^-12 m (e) 1.24*10^-11 m
2(多選).Consider an ideal gas is initially confined to part of a thermally
insulated box with a thin membrane.When the membrace is punctured,the gas
rapidly expends to fill the whole box.Compare the initial and final states
of system.Which ones of the following quantites are not varied?
(a) temperature of the gas (b) internal energy of the gas (c) pressure of the
gas (d) entropy of the gas (e) entropy of the box
3(多選).Which ones of the following statements are the postulates of the Bohr
model of hydrogen atom?
(a) The eletron moves only in certain circular orbits,called stationary states
(b) The eletron must be treated as a matter wave that each stationary state
corresponds to a standing wave.
(c) The momentum of the eletron is restriced to integer multiples of h
(d) The angular momentum of the eletron is restriced to integer multiples of h
(e) Radiation occurs only when an eletron goes from one allowed orbit to
another of lower energy.The emitted photon energy must equal to the total
energy of these two orbits.
4(多選).To give a correct interpretation of the Compton scattering effect,
Which ones of the following quantities should be quantized?
(a) photon energy (b) photon momentum (c) photon angular (d) eletron energy
(e) eletron angular momentum
o(＞＜；)o o
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