智慧树知到答案原子物理最新答案

第三章 单元测试

1、单选题：
When an electron jumps from its orbit to another orbit, energy is (   ).
选项：
A:absorbed
B:both
C:emitted
D:no effect
答案:

2、单选题：
What determines the difference in energy between two energy levels? (   )
选项：
A:number of valence electrons
B:distance between the two energy levels
C:number of electrons in the energy levels
D:distance from the nucleus
答案:

3、单选题：
According to Bohr model of hydrogen atom, the radius of stationary obit characterized by the principal quantum number n is proportional (    )
选项：
A:1/n
B:
C: n
D:
答案:

4、单选题：
In hydrogen atom the angular momentum of the electron in the lowest energy state   (   )
选项：
A:

B:

C:
D:

答案:

5、单选题：
The ratio of the speed of the electron in the ground state of hydrogen atom to the speed of light is  (    )
选项：
A:1/2
B:1/137
C:1/237
D:2/137
答案:

6、单选题：
If the electron in hydrogen atom jumps from the third orbit to second orbit, the wavelength of th emitted radiation is given by (    )
选项：
A:5/R
B:5R/36
C:R/6
D:36/5R
答案:

7、单选题：
A proton and an electron, both at rest initially, combine to form a hydrogen atom in the ground state. A single photon is emitted in this process. What is its wavelength? (    )
选项：
A:49 fm
B:15 mm
C:357 nm
D:91.2 nm
答案:

8、单选题：
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? (   )
选项：
A:0.6 V
B:12.1 V
C:35.7 V
D:569.3 V
答案:

9、单选题：
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. (    )
选项：
A:91.13 nm
B:74.5 mm
C:8.3 nm
D:49.4 fm
答案:

10、单选题：
What is the shortest wavelength present in the Brackett series of spectral lines? (  )
选项：
A:1.46 mm
B:569.34 nm
C:91.13 nm
D:327.89 nm
答案:

第四章 单元测试

1、单选题：

选项：
A:2.08 eV
B:

12.89 eV

C:7.13 eV
D:

答案:

2、单选题：
Ultraviolet light of wavelength 350 nm and intensity  is directed at a potassium surface. The maximum kinetic energy of the photoelectrons is (   )

选项：
A:3.5 eV
B:17.6 eV
C:6.9 eV
D:

答案:

3、单选题：
A metal surface illuminated by Hz light emits electrons whose maximum energy is 0.52 eV. The same surface illuminated by  Hz light emits electrons whose maximum energy is 1.97 eV. The work function of the metal is (     )

选项：
A:12.4 eV

B:47.5 eV
C:7.2 eV
D:3.0 eV

答案:

4、单选题：
The de Broglie wavelengths of a 46 g golf ball with a velocity of 30 m/s is (   )
选项：
A:

B:

C:

D:

答案:

5、单选题：
The kinetic energy of a proton whose de Broglie wavelength is 1.0 fm is   (    )

选项：
A:617 MeV

B:347 MeV
C:1.555 GeV

D:938 MeV

答案:

6、单选题：
The experiment that confirms the existence of de Broglie waves is (  )
选项：
A:Geiger-Marsden experiment
B:Millikan experiment
C:Davisson-Germer experiment

D:J. J. Thomson Experiment

答案:

7、单选题：

选项：
A:3.15 km

B:4.26 m

C:93.6 mm
D:578 nm

答案:

8、单选题：
The expectation value <x> of the position of a particle trapped in a box L wide of infinite well is (   )

选项：
A:L/2

B:

C: L

D:0

答案:

9、单选题：

The average value of 1/r for a 1s electron in the hydrogen atom is (   )

选项：
A:

B:

C:

D:

答案:

10、单选题：

选项：
A:

B:
C:

D:

答案:

第五章 单元测试

1、单选题：
An electron whose orbital quantum number is 2 has the length of angular momentum (   ).
选项：
A:

B:

C:

D:

答案:

2、单选题：
For a hydrogen atom in the 6f state, the minimum angle between the orbital angular momentum vector and the z axis is (  )

选项：
A:

B:

C:

D:

答案:

3、单选题：

选项：
A:

B:

C:

D:

答案:

4、单选题：
An experimenter wants to separate silver atoms in a Stern-Gerlach experiment by at least 1 cm (a large separation) as they exit the magnetic field. To heat the silver, she has an oven that can reach 1000°C and needs to order a suitable magnet. What should be the magnet specifications? (   )

选项：
A:39 T·m

B:24 T·m
C:75 T·m

D:57 T·m

答案:

5、单选题：
The Lande factor of  is (   )
选项：
A:2
B:3
C:0.67

D:1

答案:

6、单选题：

选项：
A:1.2 nm
B:0.6 nm

C:1.1 nm

D:1.8 nm

答案:

7、单选题：
The Bohr magneton is (   )

选项：
A:

B:

C:

D:

答案:

8、单选题：
A sample of a certain element is placed in a 0.300 T magnetic field and suitably excited. How far apart are the Zeeman components of the 450 nm spectral line of this element?  (   )

选项：
A:6.94 nm
B:3.72 fm

C:2.83 pm

D:1.45 nm

答案:

9、单选题：
In anomalous Zeeman effect, a level of give, s, l, j splits into (    )

选项：
A:0 or 2j+1 levels

B:2j+1 levels

C:2s+1 levels

D:2l+1 levels

答案:

10、单选题：
An atom with the statesis placed in a weak magnetic field. How many transitions can be observed? (   )

选项：
A:30

B:35

C:20

D:12

答案:

第六章 单元测试

1、单选题：
The total spin of two electrons is (   ).

选项：
A:0

B:1/2

C:1 or 0
D:1

答案:

2、单选题：
The maximum value of total angular momentum for electron with l=4 (   )
选项：
A:4
B:3.5
C:0
D:4.5

答案:

3、单选题：
The number of values allowed to total angular momentum j in Helium atom for a given non-zero l are  (   )

选项：
A:1

B:3

C:2

D:0
答案:

4、单选题：
The 3s state of Na has an energy of -5.14 eV. Its effective nuclear charge is (  )
选项：
A:1e

B:5e
C:1.14 e
D:11e

答案:

5、单选题：
The ground state of carbon is (   )

选项：
A:

B:

C:

D:

答案:

6、单选题：
A system of electrons is described by a wave function should be (  )

选项：
A:anti-symmetric

B:no requirement
C:symmetric

D:trial

答案:

7、单选题：
The electron configuration of Neon is  (  )

选项：
A:

B:

C:

D:

答案:

8、单选题：

选项：
A:15
B:10
C:5
D:20
答案:

9、单选题：
What atoms have the configuration (    )
选项：
A: Al
B:Mg
C:Na
D: Si

答案:

10、单选题：
How many electrons can be contained in M shell (   )

选项：
A:18

B:20

C:2

D:8
答案:

第七章 单元测试

1、单选题：
Who discovered the X ray (  ).

选项：
A:Rontgen

B:Nobel

C:Bohr
D:Einstein

答案:

2、单选题：
If we have a tungsten anode (work function  f=4.63 eV) and electron   acceleration voltage of 35 kV, what is the minimum wavelength of the x rays? (   )

选项：
A:3.89 nm

B:4.58 fm

C:3.12 pm

D: 0.0354 nm

答案:

3、单选题：
The continuum spectrum of X ray comes from  (   )

选项：
A:Auger electron

B:Pair production

C:Photoelectric effect

D:Bremsstrahlung
答案:

4、单选题：
A photon having 40 keV scatters from a free electron at rest. What is the maximum energy that the electron can obtain? (  )

选项：
A:5.41 eV

B:7.95 eV

C:1.73 eV
D: 4.32 eV

答案:

5、单选题：
A photon of wavelength 2.0 nm Compton-scatters from an electron at an angle of 90°. What is the modified wavelength? (    )

选项：
A:5.56730 nm

B: 2.00243 nm

C:9.45891 nm
D:7.67945 nm

答案:

6、单选题：
The momentum of photons corresponding to the minimum wavelength emitted from x-ray tube whose operating voltage is 120 kV is (  )

选项：
A:

B:

C:

D:

答案:

7、单选题：
An X-ray tube operates at 100 kV. The maximum speed of electrons striking the anticathode is (    )

选项：
A:

B:

C:

D:

答案:

8、单选题：
If the K, L, and M energy levels of Pt are 78000 eV, 12000 eV and 30000 eV, respectively, line from Pt is   (  )

选项：
A:43.6 pm

B:14.3 pm

C:92.6 pm

D:18.6 pm

答案:

9、单选题：
When the atomic number of the anticathode is 79,  line is  (    )

选项：
A:

B:

C:

D:

答案:

10、单选题：
In Zn the ionization energy of K shell is 9.659 KeV and L shell 1.021 KeV. The kinetic energy of the Auger electron emitted from the L shell is (   )

选项：
A:7.62 KeV

B:8.638 KeV

C:4.579 KeV
D:1.02 KeV

答案:

第八章 单元测试

1、单选题：

选项：
A:134.7 nm
B:0.5 nm
C:20.8 nm
D:1.3 nm
答案:

2、单选题：
Through what angle is a 4 MeV a particle scattered when it approaches a gold nucleus with a impact parameter of  ? (    )

选项：
A:

B:

C:

D:

答案:

3、单选题：
The energy of a hydrogen atom in the first excited state is  (    )
选项：
A:-13.6 eV
B:-0.85 eV
C:-3.4 eV
D:-1.51 eV
答案:

4、单选题：
On which of the following states of hydrogen the spin-orbit interaction has no effect? (   )

选项：
A:s state
B:d state
C: f state
D: p state
答案:

5、单选题：
How large is the magnetic field generated by the electron in the ground state of a hydrogen atom, at the position of the proton if it would circulate according to Bohr model on the shell n = 1? (    )

选项：
A:6.27 T
B:12.54 T
C:7.98 T
D:3.11 T
答案:

6、单选题：
The Lande factor of  state is (   )

选项：
A:3
B:1.5
C: 0
D:2
答案:

7、单选题：
The angle between the total and the orbital angular momenta in a  state is (    )

选项：
A:

B:

C:

D:

答案:

8、单选题：
How many lines can be expected for the  transition in sodium? (   )

选项：
A:2
B:1
C:5
D:3
答案:

9、单选题：
The de Broglie wavelength of an electron with kinetic energy of 100 keV is  (    )

选项：
A:3.702 fm
B:3.702 pm
C:3.702 nm
D:3.702 mm
答案:

10、单选题：
The work function for the photoelectric effect in potassium is 2.25 eV. For the case when light with a wavelength of   m falls on the potassium, the velocity of the fastest of the emitted electrons is (   )

选项：
A:

B:

C:

D:

答案: