Post-lab Questions: Light and Spectra Q1. The spectrum for mercury you observed

Question

Post-lab Questions: Light and Spectra Q1. The spectrum for mercury you observed spectrum. spectral charts posted in your textbook in the lab is a low resolution The in your textbook and sketch the show higher resolution spectra a number of substances. Look at a chart the chart represent spectral lines of of on the chart below. Numbers on mercury roughly to scale wavelength in the units of 102 nm. Use colored pencils to distinguish lines. red yellow orange Violet blue green Q2. From Q1, notice that the mercury spectrum has three lines shown in the yellow region. the wavelengths from the chart, calculate the frequency and energy of each of these three lines in the mercury spectrum. Show calculations for at least one line in the space to the right. Wavelength (nm) Frequency (s 1) Energy (J)

Explanation / Answer

Q2

yellow region

WL = 579 nm

WL = 577 nm

WL = 546 nm

frequency -->

v = c/WL

v = (3*10^8)/(WL *10^-9)

so

at 579 nm -- >v = (3*10^8)/(579*10^-9) = 5.18134*10^14

at 577 nm -- >v = (3*10^8)/(577*10^-9) = 5.199*10^14

at 546 nm -- >v = (3*10^8)/(546 *10^-9) = 5.49450*10^14

Energy

E = h*v

h = 6.636*10^-34 Js

at 579 nm -- > E = (6.636*10^-34)*(5.18134*10^14) = 3.43833*10^-19 J

at 577 nm -- > E = (6.636*10^-34)*(5.199*10^14) = 3.45 *10^-19 J

at 546 nm -- > E = (6.636*10^-34)*(5.49450*10^14) = 3.646*10^-19

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