With the help of the powerful plotting, animating, and programming functionalities of theMathematica software,and based on relevant formulas and laws of wave optics, several typical polarized lightphenomena have been accurately and dynamically simulated.The series of animations developed in this studyare vivid, intuitional, and thus very helpful for students to increase their knowledge of polarized lightphenomena and deepen their understanding of polarized light laws.This study adds colorful teaching resourcesto the optics course and also fully demonstrates the powerful capability of the Mathematica software to developphysics teaching resources.

Experimental researches on the physical characteristics of rotating liquid are required for collegestudents in the 2lst century.Due to the short of experimental skills ,students usually have experimental errors irthe process of experimental operation, which can affect the measurement accuracies of the gravitationalacceleration in the data processing phase.lt innovatively carried out different types of experimental errors tostudy effects of the deviation angle(a) of the transparent screen from the horizontal orientation , laser verticalincidence point offset( Ax) ,and deviation angle(y) of laser incident light from the vertical direction angle onthe acceleration of gravity measurement.The analysis results show that a deviation angle of 5° of the transparentscreen from the horizontal orientation can lead to a 5.5% error in the acceleration of gravity measurement.Aaser vertical incidence point offset about 5 mm can result in an experimental error of about 12%.Moreover,a16.3% measurement error can be obtained by an incident light deviating 5° from the vertical direction to theleft while the error grows to 22.9% when the laser incident light deviates 5° from the vertical direction to theright. These findings can provide theoretical foundations and teaching tips for teachers in colleges anduniversities to reduce the measurement error of gravity acceleration when guiding students to conductexperiments on rotating liquid characteristics.

The development and application of the scientific computing software Matlab have promoted studentsto perform data processing, image analysis, and fitting experiments in the University Physics Experimentscourse.The data image visualization capability of Matlab software is exhibited by the Frank Hertz experimentThis perfectly shows the multiple peaks formed by the polar plate current variation with the accelerated voltage.The Planck constant is measured based on the photoelectric effect to present the capacity , such as, theexperimental data fitting, integrating the experimental curve , analyzing the relationship between the cut-offvoltage and the incident light frequency ,obtaining the fitted curve and calculate the magnitude of the Planckconstant.The introduction of Matlab can enhance students’ creativity in experiments , which helps cultivatestudents' scientific literacy and logical thinking ability and lays a solid foundation for students' future study andresearch work.

The output voltage of the force sensor is an important parameter to be measured in the experiment ofmeasuring liquid surface tension coefficient by pulled off method. lt is very important to understand theexperimental principle and improve the accuracy of the experimental measurement.lt focuses on the study of thestate of the ring and the liquid film ,the change of force and the change of voltage with the height of the liquidhilm carried out by the ring during the measurement process,based on the experimental principle of measuringliquid surface tension coefficient by traditional pulling method.Finally,the selection of voltage measurementpoint in the experiment is clarified, the theoretical analysis formula is modified and the experiment ayerification is carried out.The verification results show that when the sling is in the critical state , the sensoroutput voltage U, should be selected as the maximum value of the voltage reading,which is more consistentwith the experimental principle.Moreover,the quality of the liquid film can not be ignored and should beincluded in the theoretical analysis and calculation to get more accurate results.The research results canprovide analysis ideas and reference for the course teaching of this experiment.

In view of some shortcomings of the original device for measuring the Young's modulus of the tensilemethod ,the device for measuring the Young's modulus of the tensile method in college physics experiments hasbeen improved.The newly designed experimental device places the entire instrument horizontally , fixes themeasured metal wire through two quick change chucks, and uses a fixed sliding wheel group to make themeasured steel wire twist on the pulley to increase the length of the measured metal wire , The elongation of themetal wire is directly measured with a digital dial indicator. The improved Young's modulus measuring devicehas simple structure , simple operation ,fast measurement , high accuracy and good use effect.

It points out the main factors that affect the accurate measurement of sodium light wavelength in thedouble prism interlerence experiment; delermination of the position of virtual light source, measurement ovirtual light source spacing, and measurement of inteference fringe spacing. The research shows that thposition of virtual light source can be accurately determined by the lens imaging method.n addition,the virtuaight source spacing can be accurately measured by using the lens imaging method to measure the spacing othe magnified image of the virtual light source and the corresponding object and image distances. Finally, theinterlerence fringe spacing can be accurately determined by measuring and averaging the distances of as many interference fringes as possible farther away from the virtual light source.Using these measurement methods . thesodium light wavelength can be accurately obtained.

A simple sound velocity measurement device based on smartphone is designed to take accuratemeasurements of the sound velocity in different propagation media using the standing wave method. In theexperiment ,the FreqCounter APP on the smartphone is used to generate a single frequency acoustic signal.TheDaTuner APP,on the other hand, is used to detect in real-time the frequency and intensity of the acousticwave.By measuring the distance between adjacent antinodes or nodes , the sound velocity can be calculated according to the relationship among the frequency, the sound velocity, and the distance between adjacentantinodes.The sound velocity values obtained from the experiments are in good agreement with the theoreticavalues.

The measurement of metal electron escape work is equivalent to determining electron potentiaenergy, which is of great significance for understanding the microscopic atomic structure , especially formodifying the relevant nuclear structure theory and calculation methods.The process of escape work experimentskillfully combines the relationship between various energy levels of metal tungsten crystal cells.lt flexibly usesthe characteristics of linear fitting to simplify the data relationship, which plays a guiding role in the study ofmodern physics experiments. Because of the differences in the escape work measured by differentexperimenters,the escape work is likely related to the crystal plane of tungsten used in the experiment.Therefore ,based on the first principle , the electron escape work of tungsten with different crystal planes canalso be calculated directly.We will compare the metal electron escape work obtained by experimental operationand first-principles calculation, and intuitively analyze the influence of different crvstals on metal electronescape work to provide new ideas and ways to study physical experiments.

The acceleration and velocity sensors of smart phone are introduced into the experiment ofmeasuring the rotational inertia of a rigid body with three-wire pendulum method.lt makes the periodic processof rigid body oscillation more vivid.Through the “ acceleration-time”and “velocity-timeimages automatically drawn by the mobile phone ,the swing period of the rigid body is obtained , and the rotational inertia of the rigidbody is measured.The results show that the measured data by smart phone sensor are reasonable and therelative error is in the allowable range of experiment. The introduction of smart phone in college physicsexperiment can not only enhance students’cognition of new technology and stimulate students’ desire for newknowledge , but also expand students’ thinking and cultivate students’ spirit of innovation.

Based on the OBE education concept,through the implementation of the “ 12345”reform anddevelopment strategy,that is,through the “ one idea,two models ,three means ,four transformations”and otherreforms and practices of of the teaching system of the college physics experiment, the students’ innovativepractical ability ,teachers’teaching and research level and sense of professional gain , the level of curriculuminformatization,the openness of the center and the exemplary role have finally been realized.The basic practicate aching level of the school has been improved in five steps.ln particular,the problems existing in the currentexperimental teaching has been effectively solved through the teaching mode of virtual and real topology",andhas been also recognized by the majority of teachers and students.