Physics Practical the Ratio of Book Report

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DISCUSSION:

The line of best fit is very close to the actual data points in Graph 1, suggesting that these data points are very accurate and precise. At the same time, the lack of perfection suggests there are some possible sources of unmeasured and unwanted influence on the value of the charge-to-mass ratio. Careless error and systematic error are the two possible sources of influence in this experiment; observational errors due to a lack of brightness of the electron beam or other issues would fall under the category of careless error, while any lack of consistency or proper calibration in the apparatus would result in a systematic error.

Creating the proper environment for accurate observation, including darkening the room and using a high enough voltage in the magnetic coils (1500V) can create a situation where the electron beam is most visible, reducing the potential for careless error. Proper maintenance of the equipment being used in the experiment will help to ensure that systematic errors are reduced if not eliminated, though proper measurement and calibration remain necessary.

Regardless of the strength and the voltage intensity of the electric filed E, the electron beam remains uninfluenced. Slight curves are created in the beam due to the lack of complete uniformity in the magnetic field; as the beam interacts with the magnetic field at many points and at a certain volume in space, rather than at a single distinct point, variations in the magnetic field cause slight curves and shifts in the beam. The electric field also lacks uniformity at and near the edges of the deflecting plates, which exacerbates these slight curvatures.

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1.76 x 10 C/kg is an established and excepted value for the charge-to-mass ratio of electrons. The calculated value of the charge-to-mass ratio in this experiment is . The percentage of difference between the calculated value and the accepted value can be demonstrated by the below formula to be 96.5%:

[ (Calculated value -- " Accepted value) / (Accepted value) ] x 100%

CONCLUSION:

The difference between the calculated charge-to-mass ratio in this experiment and the accepted value for charge-to-mass ratio is 96.5%. This is a very significant difference, with the calculated value found in this experiment nowhere near the accepted value established form previous experimentation and observation. Plotting the value of I2 and V and plugging the results into the given equation can help to recalculate the charge-to-mass ration, and more importantly the experiment can be repeated to produce more data sets in order to obtain an experimental value that is closer to the established accepted value. Utilizing different pieces of equipment in the same set up would….....

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