2024知到答案 Math model of metal heating under action by laser beam（1） 最新智慧树满分章节测试答案
第一章 单元测试
1、单选题：
Steps at the math modeling are（ ）。
选项：
A:Developing finite-difference schemes (finite-elements scheme) for numerical solution of the problem under consideration.
B:Quality’s analysis of uniqueness solution or multiplicity of the problem solution. For this aim, as a rule, the pointwise model is derived from PDEs.
C:Analysis of physical units of each terms involving in the equations.
D:Introducing dimensionless variables and writing similarity parameters (π - parameters).
E:Analysis of the physical and chemical processes occurring in process under consideration.
F:Derivation of the conservation laws (integrals of motions) for the problem under consideration.
G:Writing of the differential (and other) equations describing the process under consideration.
答案: 【Writing of the differential (and other) equations describing the process under consideration.】
2、单选题：
Which of the following options is the requirement for the numerical method?（ ）。
选项：
A:High order of approximation of the differential equations by numerical solution.
B:All of the above
C:FDS must be economical one. It means that 3D or 2D difference equations must be solved as sequence of 1D difference equations.
D:The numerical method must be tested by using the well-known solutions of the problem under consideration.
答案: 【All of the above】
3、多选题：
The following are applications of laser radiation in the field of physics?（ ）。
选项：
A:Nanophotonics
B:Optical data storage(CD, SVD, 5D optical memory)
C:Astrophysics
D:Photochemistry
答案: 【Nanophotonics;
Optical data storage(CD, SVD, 5D optical memory);
Astrophysics】
4、多选题：
What fields can laser radiation be used in?（ ）。
选项：
A:Laser Chemistry
B:LaserBiology
C:LaserMedicine
D:Physics
答案: 【Laser Chemistry;
LaserBiology;
LaserMedicine;
Physics】
5、多选题：
What are the properties of laser radiation?（ ）。
选项：
A:Stimulated emission.
B:Laser emits monochromatic wave. Usually laser emits single wavelength.
C:Divergence of laser beam is small.
D:Coherence (spatial, temporal).
E:Polarization.
答案: 【Stimulated emission.;
Laser emits monochromatic wave. Usually laser emits single wavelength.;
Divergence of laser beam is small.;
Coherence (spatial, temporal).;
Polarization.】
6、单选题：
The one that can explain the experimental curve of blackbody radiation perfectly is （ ）
选项：
A:Planck's formula
B:the Riley-Pierce equation
C:Einstein's formula
D:Wien's formula
答案: 【Planck's formula】
7、单选题：
A concave cavity with a concave mirror of radius R equal to the cavity length L is a （ ）.
选项：
A:Uncertain
B:Critical cavity
C:unsteady cavity
D:Stabilizing cavity
答案: 【Critical cavity】
8、单选题：
The wavelength of the CO2 laser is（ ）
选项：
A:10.6μm
B:335nm
C:810nm
D:1064nm
答案: 【10.6μm】
9、单选题：
The basic structure of the laser consists of electrical working matter, pump source and （ ） three parts.
选项：
A:Reflector
B:Affected pole
C:Optical resonant cavity
D:Window mirror
答案: 【Optical resonant cavity】
10、单选题：
Carbon dioxide lasers commonly used gas mixture composition is composed of （ ）, helium, argon, nitrogen.
选项：
A:Oxygen
B:Carbon dioxide
C:Carbon monoxide
D:Neon gas
答案: 【Carbon dioxide】
第二章 单元测试
1、单选题：
What type of laser does the carbon dioxide laser belong to?（ ）
选项：
A:Solid-state laser
B:Gas laser
C:Semiconductor laser
D:Fiber laser
答案: 【Gas laser】
2、单选题：
When the pulse energy is certain, the narrower the pulse width, it means the time energy density with time as the denominator （ ）.
选项：
A:Uncertain
B:The greater
C:Constant
D:the smaller
答案: 【The greater】
3、单选题：
For a uniformly broadened medium, the small-signal gain coefficient at the center center frequency is G0(v0), and when I=Is, saturation is significant, and the non-small-signal center-frequency gain coefficient is: （ ）.
选项：
A: 
B: 
C: 
D: 
答案: 【 】
4、单选题：
The following statement about the electric field induction formula is correct （ ）。
选项：
A:ε (z,x,y,t ) is dielectric permittivity
B:all
C:P (z,x,y,t ) is polarization of a medium
D:E (z,x,y,t ) is electric field strength
答案: 【all】
5、单选题：
What is the Duffing’s equation used to calculate electron displacement? （ ）
选项：
A:
B:
C:
D:
答案: 【】
6、单选题：
The threshold condition is the formation of laser（ ）。
选项：
A:sufficient necessary condition.
B:Indeterminate.
C:necessary condition.
D:sufficient condition.
答案: 【sufficient necessary condition.】
7、单选题：
When a laser propagates from one medium to another with a different refractive index, a (C) will appear at the interface between the media（ ）。
选项：
A:Refraction
B:Neither
C:Reflections
D:Reflection and refraction
答案: 【Reflection and refraction】
8、单选题：
The collisional broadening spectral line is（ ）。
选项：
A:Lorentzian linear
B:Gaussian line type
C:Hyperbolic type
D:Parabolic type
答案: 【Lorentzian linear】
9、单选题：
Particle number reversal distribution state microscopic particles satisfy （ ）
选项：
A:Negative temperature distribution
B:Fermi distribution
C:Bormanz distribution
D:Gaussian distribution
答案: 【Negative temperature distribution】
10、单选题：
At a certain temperature, the odds of spontaneous radiation are （ ） times greater than the odds of excited radiation
选项：
A:
B:
C:
D:
答案: 【】