Phys Lab8 - three lines: red, blue-green, blue. From the...

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Physics 263 – Section 201 The Spectrum of Atomic Hydrogen Mohand Shalaby – G00572364 Partners: Lado Tonia . Instructor: R. W. Ellsworth Experiment done on: 5 th of April 2010
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Physics 263 Mohand Shalaby Experiment – 8 The Spectrum of Atomic Hydrogen 1. Introduction: In this experiment we are going to look at the spectrum of a hydrogen atom when heated adequately. A heated gas at low pressure will typically emit light only at certain characteristic wavelengths (λ) that appear as a series of colored lines. We used this equation to find the angles: Balmer’s formula for λ is: Where the Rydberg constant (R) has the value of 1.097*10 -7 . 2. Apparatus: For this experiment we used the apparatus shown in Fig1:
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Fig1: the apparatus setup used in this experiment. 3. Procedure: For this experiment, we setup the apparatus shown in the previous page. The spectrum lamp was turned on, and at the diffraction plate (1.12m away) we measured the right and left positions of each colored line. Unfortunately, my lab partner and I could only see the first
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Unformatted text preview: three lines: red, blue-green, blue. From the positions we got, we calculated the angles and from the angles we calculated the wavelengths and compared them with the predicted wavelengths. And finally, we plotted a graph of 1/Lambda vs 1/j^2 experimental and predicted and used a least-square fit to get R and compare it with the known value. 4. Data And Analysis: The plotted graph of 1/Lambda vs 1/j^2 experimental and predicted: 5. Discussion: In this experiment, we are showing that hydrogen as any gas, when heated sufficiently at low pressure emits light at certain wavelength spots. We could only see the basic three lines: red, blue-green and blue. We measured their positions and got the angles as well as the wavelengths. We used all this data together to plot the graph seen above. To further compare the measured and predicted wavelengths we found the rms deviation and got: 8.98762*10-9 and that value shows that we measured our readings with a nano meter error....
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This note was uploaded on 05/10/2010 for the course PHY 263 taught by Professor Markk during the Spring '10 term at George Mason.

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Phys Lab8 - three lines: red, blue-green, blue. From the...

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