The effect of distance between point light source and target metal to stopping potential

Akay, Ertuğrul (2014) The effect of distance between point light source and target metal to stopping potential. Other thesis, TED Ankara Koleji.

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Abstract

The research question of the experiment is “In a photoelectric system , what is the effect of distance between tungsten lamp and the metal photoelectric module on the stopping potential of system and how does the effect vary with changing wavelength of light?”. The research question stated with an assumption , “If the distance between the light source and target metal is increased, the stopping potential applied for the photoelectrons decreases.” to check the formula based on photoelectric theory. The reason of this research question came with a curiosity that how can a formula based on a theory can be 100% precise and why miscellenous conditions have no effect on the results? The investigation was started with a pre-experiment to examine the uncertainty value of photoelectric system. The experiment was consisted of evaulating Planck constant which could differ slightly due to the usage of different material. Then the main experiment was occured with the same material and without any difference in controlled variables except the change in distance between light source and target metal to stopping potential of the photoelectric system. To find a result with less uncertainty, five color filters used in both of the experiments and line graphs were drawned to define the relation between Planck constant and distance between light source and target. This relation allowed us to comment on relation between stopping potential and distance between light source and target metal. The results of the experiment supported the hypothesis “If the distance between the light source and target metal is increased, the stopping potential applied for the photoelectrons decreases.”As a conclusion the variables such as distance intensity of light, air condition have slightly affects on stopping potential, that’s why the literature formula does not consist of these factors.

Item Type: Thesis (Other)
Additional Information: Supervisor: Mine Gökçe Şahin, IB Notu: D
Uncontrolled Keywords: point light source
Subjects: Q Science > QC Physics
Depositing User: Kamil Çömlekçi
Date Deposited: 09 Mar 2015 14:00
Last Modified: 09 Mar 2015 14:21
URI: http://tedprints.tedankara.k12.tr/id/eprint/569

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