原子物理 知到智慧树答案2024 z16201

第一章 单元测试

1、
The energy scale of atom is (   ). 

A: TeV
B: GeV
C: eV
D:MeV
答案:  eV

2、
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 

3、
Who did propose that the matter was indivisible in ancient Greece? (    ) 

A:Plato
B:Aristotle
C:Democracy
D:Archimedes
答案: Democracy

4、
 Who did firstly show the Periodic table?  (    )  

A:Mendeleev 
B:Avogadro 
C:Proust
D:Faraday 
答案: Mendeleev 

5、
 How many elements are discovered up to 2019? (    ) 

A:118
B:117
C:115
D:112  
答案: 118

6、
What was found by Roentgen in 1895? (    )

A:Proton 
B:neutron
C:X ray 
D:Electron
答案: X ray 

7、
The law of black-body radiation was given in 1900 by (    )? 

A:Plank
B:Boltzmann
C:Rutherford
D:Bohr
答案: Plank

8、
Which model can exactly solve the Hydrogen system? (   )

A:Bohr model
B:Schrodinger equation
C:Rutherford model 
D:Dirac equation 
答案: Dirac equation 

9、
Which field is not related to atomic physics? (    ) 

A:Plasma physics 
B:Astrophysics
C:Literature
D:Environment
答案: Literature

10、
 Who did not join the Solvay conference held in 1927? (   )  

A:Einstein
B:Pauli 
C:Fermi  
D:Schrodinger
答案: Einstein

第二章 单元测试

1、
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 

2、
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

3、
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 

4、
In Rutherford atomic model alpha particles were stroked on  (    )  

A:titanium
B:aluminum 
C:silver
D:gold 
答案: gold 

5、
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

6、
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:

7、
According to structure of atom electron should fall in (   )?  

A:nucleus
B:outer environment
C:shell 
D:space
答案: nucleus

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 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 

9、
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° 

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

第三章 单元测试

1、
When an electron jumps from its orbit to another orbit, energy is (   ).  

A:absorbed 
B:emitted 
C:no effect 
D:both
答案: both

2、
 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

3、
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 

4、
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

5、
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 

6、
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

7、
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

8、
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 

9、
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

10、
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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