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A:10° B:Plasma physics C:Astrophysics D: Environment 答案: 10° What fraction of a beam of 7.7-MeV alpha particles incident upon a gold foil 3.0×10-7 m thick is scattered by less than 1°? ( )
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The energy scale of atom is ( ).
A: TeV
B: GeV
C: eV
D:MeV
答案: eV
The density scale of atom is ( )
A:1010 g/cm3
B:1 g/cm3
C:1015 g/cm3
D:102 g/cm3
答案: 1 g/cm3
Who did propose that the matter was indivisible in ancient Greece? ( )
A:Plato
B:Aristotle
C:Democracy
D:Archimedes
答案: Democracy
Who did firstly show the Periodic table? ( )
A:Mendeleev
B:Avogadro
C:Proust
D:Faraday
答案: Mendeleev
How many elements are discovered up to 2019? ( )
A:118
B:117
C:115
D:112
答案: 118
What was found by Roentgen in 1895? ( )
A:Proton
B:neutron
C:X ray
D:Electron
答案: X ray
The law of black-body radiation was given in 1900 by ( )?
A:Plank
B:Boltzmann
C:Rutherford
D:Bohr
答案: Plank
Which model can exactly solve the Hydrogen system? ( )
A:Bohr model
B:Schrodinger equation
C:Rutherford model
D:Dirac equation
答案: Dirac equation
Which field is not related to atomic physics? ( )
A:Plasma physics
B:Astrophysics
C:Literature
D:Environment
答案: Literature
Who did not join the Solvay conference held in 1927? ( )
A:Einstein
B:Pauli
C:Fermi
D:Schrodinger
答案: Einstein
State the mass of Avogadro’s number of atoms for Copper ( ).
A:127.10 g
B:63.55 kg
C:23.22 g
D:63.55 g
答案: 63.55 g
The mass of a single iron atom is 9.3 × 10–23 g. Determine the number if iron atoms in regular cube that measures exactly 10 cm on an edge. The density of iron is 7.86 g/cm3 ( )
A:3.5 × 1025
B:8.5 × 1025
C:7.5 × 1024
D:4.2 × 1026
答案: 8.5 × 1025
The mass of a proton is ( )
A: 0.511 MeV
B:1.673× 10-24 g
C:3.344× 10-27 kg
D:10.07 u
答案: 1.673× 10-24 g
In Rutherford atomic model alpha particles were stroked on ( )
A:titanium
B:aluminum
C:silver
D:gold
答案: gold
For aluminum ( Z2 = 13) and gold ( Z2 = 79 )targets, what is the ratio of α particle scattering at any angle for equal numbers of scattering nuclei per unit area? ( )
A:134.5
B:0.03
C:36.93
D:1.47
答案: 36.93
For an 8.0-MeV α particle scattering from a gold atom ( Z = 79 ) of radius 0.135 nm, the largest scattering angle, θ is ? ( )
A:
B:
C:
D:
答案:
According to structure of atom electron should fall in ( )?
A:nucleus
B:outer environment
C:shell
D:space
答案: nucleus
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 nucleus must be positively charged
C:The nucleus must be very small compared to the atom
D:The mass of the atom is mostly concentrated in the nucleus
答案: The nucleus must be positively charged
A 5.0-MeV alpha particle approaches a gold nucleus with an impact parameter of 2.6×10-13 m. Through what angle will it be scattered? ( )
A:10°
B:Plasma physics
C:Astrophysics
D: Environment
答案: 10°
What fraction of a beam of 7.7-MeV alpha particles incident upon a gold foil 3.0×10-7 m thick is scattered by less than 1°? ( )
A:1.35
B: 0.67
C:0.05
D:0.84
答案: 0.84
When an electron jumps from its orbit to another orbit, energy is ( ).
A:absorbed
B:emitted
C:no effect
D:both
答案: both
What determines the difference in energy between two energy levels? ( )
A:distance between the two energy levels
B:number of electrons in the energy levels
C:distance from the nucleus
D:number of valence electrons
答案: distance between the two energy levels
According to Bohr model of hydrogen atom, the radius of stationary obit characterized by the principal quantum number n is proportional ( )
A:n2
B: n
C:1/n
D:1/n2
答案: n2
In hydrogen atom the angular momentum of the electron in the lowest energy state ( )
A:2h
B:2p/h
C:h/2p
D:h/p
答案: h/2p
The ratio of the speed of the electron in the ground state of hydrogen atom to the speed of light is ( )
A:2/137
B:1/237
C:1/2
D:1/137
答案: 1/137
If the electron in hydrogen atom jumps from the third orbit to second orbit, the wavelength of th emitted radiation is given by ( )
A:36/5R
B:5/R
C:5R/36
D:R/6
答案: 36/5R
A proton and an electron, both at rest initially, combine to form a hydrogen atom in the ground state. A single photon is emit- ted in this process. What is its wavelength? ( )
A:91.2 nm
B:15 mm
C:49 fm
D:357 nm
答案: 91.2 nm
A beam of electrons bombards a sample of hydrogen. Through what potential difference must the electrons have been accelerated if the first line of the Balmer series is to be emitted? ( )
A:569.3 V
B:35.7 V
C:0.6 V
D:12.1 V
答案: 12.1 V
The longest wavelength in the Lyman series is 121.5 nm and the shortest wavelength in the Balmer series is 364.6 nm. Find the longest wavelength of light that could ionize hydrogen. ( )
A:49.4 fm
B:91.13 nm
C:74.5 mm
D:8.3 nm
答案: 91.13 nm
What is the shortest wavelength present in the Brackett series of spectral lines? ( )
A:569.34 nm
B:327.89 nm
C:1.46 mm
D:91.13 nm
答案: 1.46 mm
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