Zhikai AtomicSpectra - PC1222 Lab Report: Atomic Spectra|...

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PC1222 Lab Report: Atomic Spectra|| ||Wang Zhikai|| ||A0080959N|| ||Group B6|| PC1222 Lab Report: Atomic Spectra|| ||Wang Zhikai|| ||A0080959N|| ||Group B6|| 1 Objectives To investigate if the visible light wavelengths of hydrogen as predicted by the Bohr theory agree with the experimental values. To determine an experimental value for the Rydberg constant using a fit of the measured values of hydrogen wavelengths to the Balmer equation. To identify the two unknown elements by their visible optical spectra using the results obtained earlier. 2 Introduction When a cart slides down an inclined track, it’s acceleration in the direction of the x-axis is equal to gsin Ɵ , where g is the gravitational force due to the Earth’s gravitational pull and Ɵ is the angle of inclination of the track. When there is no interference and there is minimal friction between the track and the cart, the mechanical energy E of the system will remain constant due to the principle of conservation of mechanical energy. Mechanical energy consists of gravitational potential energy and kinetic energy, and the sum of these two components will remain constant in an (approximately) isolated system. 3 Methodology Part A: Accelerated Motion due to Gravity We elevated one end of the inclined track by 14 cm using the laboratory jack and measured the elevation with a measuring tape. We then measured the distance between the two ends of the inclined track and recorded this distance as L in Data Table 1. We positioned the two photogates on the inclined track and recorded the distance between them as d . We placed a picket fence onto the top of the cart and connected the photogates to the Smart Timer. We held the cart steady near the top of the inclined track and released it such that it moved freely through the photogates. We then recorded the velocities v 1 and v 2 , the velocities as the cart passes through photogates 1 and 2 respectively. We repeated this four more times to obtain 5 sets of data. We then lowered the elevation of the track by 1 cm and repeated the previous steps for a total of four different heights. Part B: Conservation of Mechanical Energy We measured the mass of cart as m (kg) and also the height H (cm) of the elevation of the inclined track. We then set up the Smart Timer and connected the photogates to the timer. We held the cart steady near the top of the inclined track and released it such that it moved freely through the photogates. We then recorded the velocities v 1 and v 2 , the velocities as the cart passes through photogates 1 and 2 respectively. We varied m by adding masses to the top of the cart and repeated the previous steps until we obtained 3 sets of data. We then used the laboratory jack to adjust the height of the elevation of the inclined track and repeated the previous steps until we had 3 sets of data each, for a total of three different heights. 4
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Zhikai AtomicSpectra - PC1222 Lab Report: Atomic Spectra|...

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