Physics Lab Report

Physics Lab Report
1. For the wavelength measurement of different colors in the Hydrogen spectrum done in the lab, tabulate your data recorded along with the wavelength calculations performed for all colors in the spectrum. (2 points)
Line Color a_left (m) a_right (m) a_average (m) sinq nm
Red
0.235
0.27
0.2525
0.182145
5.47E-09
Green-Blue
0.17
0.33
0.25
0.180505
5.42E-09
Indigo
0.16
0.35
0.255
0.18378
5.52E-09
Violet?
0
0
0
0
0
To find the wavelength for all of the colors in this lab we used two equations. Sin(θ)=a(average)/((b2 +a(average)2)(1/2)) and dsin(θ)=mλ. 2. Tabulate your data recorded along with the wavelength calculations performed for violet and red colors seen in the spectrum of the white light bulb. (2 points)
Color
a_left (m) a_right (m) a_average (m) sinq nm
Red
0.226
0.226
0.226
0.151568
656.335
Violet
0.156
0.156
0.156
0.106533
410.21

3. List the different wavelengths specified in the spectrum of the Mercury (green spectral line) and the Sodium (yellow spectral line) lamp. (1 point)
Mercury lamp:
Green
0.2
0.2
0.2
0.146789
4.41E-09

Sodium lamp:
Sodium (Na) b =
1.16

Line Color a_left (m) a_right (m) a_average (m) sinq 
Yellow
0.24
0.2
0.22
0.157819
4.74E-09

4. Calculate the frequencies of the violet and red colors seen in the spectrum from the white light bulb. Which color has the higher frequency? (1 point)
5. Calculate the frequency of colors seen in the spectrum of Hydrogen lamp. Compare them to the expected values calculated using the empirical formula for Balmer series. (2points)
Frequencies can be calculated by the formula
6. Are the spectra seen in this lab Emission Spectra or Absorption Spectra? Justify your answer. (1 point) 7. For the hydrogen lamp, what would be the wavelength if the transition of the electron is from n=7 to n=2 levels? (2 points)
8. A star has an emission spectrum consisting of spectral lines with wavelengths (in nm): 410.2, 486.1, 546.0, 589.0, and 656.3. What does this tell you about what the star is made of? (1 point)