When a certain wavelength of light passes through the liquid，some of the light intensity will be absorbed by the liquid，and the absorption ability of different concentrations of liquid to the light intensity will be different．The remaining light intensity after liquid absorption will still cause photocurrent to be generated in the phototube．Based on the experimental principle of photoelectric effect，the corresponding photocurrent of the same liquid at different concentrations was measured．The calibration curve of the two is drawn，and the linear equation of the two is fitted by computer．That is，the corresponding concentration of the liquid can be calculated only by measuring the photocurrent of the liquid after light blocking through the photoelectric effect tester．

Young’ s double. slit interference ( YDSl) is an important content in the courses like Optics ,College Physics , and its basic principle is widely used in engineering technology. In this paper, YDSl experiment was simulated by programming with MA'TLAB, and the simulation results straightforwardly show the effects of theslit spacing, the distance between the slit and the receiving screen and the light wavelength on the YDSlP articularly, we simulated the YDSl experiment with the white light as a light source, based on which weshowed the color spectrum of dispersion induced by the interference , and the mechanism for the change of light intensity and spectral contrast, In addition, we further compared the simulation results of measuring there fractive index of transparent dielectric films when using, separately , monochromatie and white light as light sources , demonstrating the limitation of a monochromatic light source in the experiment, The simulation experiment performed in this work is of great significance not only for deepening students’ understanding on the light interference ,but also for enriching the teaching content of YDSl, and cultivating students’ scientific exploration literacy and improving their ability to analyze and solve problems using information technology.

The Frank-Hertz experiment is important for verifying the quantization of electron energy and is aclassie in recent physics experiments, However, the experimental results are generally limited by the experimental conditions and data processing methods. In this paper, Matlab soltware is used to calculate the first excitation potential of monatomie gas argon by segmented linear interpolation , three times Hermite inte rpolation and three times spline interpolation and ploting the curve of eight sets of measured data, and it is found that the curve fitted by three times spline interpolation is smoother and the consisency of the results is belter. Meanwhile ,the first exeitation potential of the gas argon is obtained by the quantum mechanics-based first nature prineiple caleulation, and compared with the experimental results, it is found that compared with the Perdew-Burke-Erzerhof( PBE ) generalized funetion, the first excitation potential calculated by using theHeyd-Seuseria-Emzerhof( HSE06 ) generalized function has a better agreement with the experimental value ,and the introduction of spin-orbit coupling leads to the cleavage of the energy level but does not change theexeitation potential significantly.

The traditional method can effectively improve the magnification，but additional devices are needed to determine the reflection times．Through the combination of a large plane mirror placed in a slant to the mirror of the optical lever，the number of reflections is accurately controlled to 2 levels，and the optical path is increased while an angle change is increased．Finally，the magnification is increased to 4 times of the traditional lever method．Theoretical analysis and experimental results show that the oblique double mirror method is used to measure the Young’s modulus of metal wire． The experimental results are in good agreement with the theoretical analysis，which verifies the effectiveness of the method and theory．In addition，the amplification factor is as high as 84．36 times in the limited space not more than 80 cm．

Billiards is a sport full of strategy and skill. During the entire process of a single strke ,the collisionbehween the cue and the white ball, the collision between the white ball and the target ball, as well as theeollision between the white ball and the edge of the table can be approximately regarded as ideal perfectlyelastie collisions. For these three seenarios , ideal physical models for billiards collisions and movements areestablished,Based on physical prineiples such as the momentum theorem, the law of roation, the law ofeonservation of momentum ,and the law of conservation of mechanical energy , this exploration delves into therelationship between the foree applied when the cue strikes the white ball, the angle of collision between thewhite ball and the target ball, and the final orientation of the white ball, and conduct analysis to providetheoretical referenee for improving hiting efieieney.By using the example of billiards collision molion ,studentscan gain a deeper understanding of physical laws and their applications ,and stimulate their interest in learningand innovative thinking.

The influence of the grating on the spectrometer table which rotated a certain angle on the change of diffraction angle is analgzed theoretically，and through the Matlab software to make surface chart which can visually observe the change of diffraction angle as you increase the rotation angle and the diffraction angle． Compared the experimental measurements with theoretical derivation，found that the grating rotated a certain angle，the change of diffraction angle used in the calculation increases with the increase of the diffraction angle，and it will cause some errors in the calculation of wavelength．

Ｒainbow and secondary rainbow are magical natural phenomena in the atmosphere． In order to visually observe the rainbow and secondary rainbow and explore their optical phenomena and influencing factors，we designed two demonstration devices for reproducing the rainbow and secondary rainbow，which can reproduce the phenomenon of the rainbow and secondary rainbow at the same time，measure the observation position and the incidence of the rainbow and secondary rainbow．The angle of light，explore the reasons and conditions of the formation of rainbow and secondary rainbow phenomenon． Through the observation and analysis of the rainbow and secondary rainbow produced by transparent glass balls with different diameters，it is indirectly proved that the larger the raindrop，the more significant the rainbow and secondary rainbow phenomenon，and the exit angle of the rainbow and secondary rainbow has nothing to do with the diameter of the water drop．The rainbow and secondary rainbow demonstration device has simple operation，clear phenomenon and low cost．It is very suitable to extend to classrooms or science and technology museums to help understand the rainbow phenomenon and its optical principles．

This article explores the influence of factors such as the ratio arm value and bridge arm resistance/alue on the sensitivity of the Wheatstone bridge experiment by constructing a simple Nike function. Themalysis shows that the influenee of the ratio arm value on the sensitivity of the bridge depends on theidjustment method of the ratio arm.By adjusting different bridge arm resistanees to change the ratio arm , thenlluenee of the ratio arm on the sensitivity of the bridge is dilrerent: When the ratio arm value is fixed .thereexist a set of bridge arm resistance values that maximizes the sensitivity of the bridge.

On the basis of the experimental device for measuring the moment of ineria of rigid body using thefalling body method , two magnets are installed.The " magnetometer" option in the mobile phone Phyphoxsoftware is used to measure the data of the magnetic field variation over time when the stage rotates.Based onthis data, determine the change in the angle of rotation of the stage over time and caleulate the angularaeceleration of the stage , thereby caleulating the system's moment of inertia.The relative error of the moment ofinertia measured by this method for dise , ring, and eylindrical specimens is less than 19, Through wirelessnetworks , mobile phones and computers can be intereonnected ,and experimental data can be displayed in real-time in the form of charts on the computer desktop,making the experimental process more intuitive.

“Curriculum ideological and political education” is an important measure for colleges and universities to realize the fundamental task of values establishment and people cultivation． College physics experiment course is a good carrier of “curriculum ideological and political education”．The infiltration of ideological and political education into the teaching of college physics experiment course can make the ideological and political education contained in college physics experiments present vividly in the minds of students，which is favour of cultivating the students’scientific literacy．In order to find an effective way to combine curriculum teaching with ideological and political teaching，the overall teaching design of “college

physics experiment”for“Ideological and Political Course”has been carried out．Taking Newton’s ring as an example，how to integrate the ideological and political elements of the course into all aspects of college physics

experiment teaching has been discussed，in addition，student evaluation and teaching summary are given．