Astronomy 101 Lab 3

Astronomy 101 Lab 3 Measured separation d of lines A and D, top spectrum Wavelength between difference A and D Scale d = 95 nm 246.2 S = 246.2 / d = 95. = 2.6 How far is line A from reference line? Observed wavelength X = 4 nm (656.3 – 2.6 (4) = 645.9 In the third spectrum, how far is line A from the reference line? (in nm) What is the observed wavelength of line A in spectrum 3? (656.3-x*s) X= 22 nm 599.1 nm In the second spectrum, how far is line B from the reference line? What is the observed wavelength of line B in spectrum 2? (486.1.3-x*s) X= 2.5 nm 479.6 nm In the second spectrum, how far is line C from the reference line? What is the observed wavelength of line C in spectrum 2? (434.0-x*s) X= 1 nm 431.4 nm In the second spectrum, how far is line D from the reference line? What is the observed wavelength of line D in spectrum 2? (410.1-x*s) X= 1 nm 407.5 nm In the third spectrum, how far is line B from the reference line? What is the observed wavelength of line B in spectrum 3? (486.1.3-x*s) X = 14 449.7 nm In the third spectrum, how far is line C from the reference line? What is the observed wavelength of line C in spectrum 3? (434.0-x*s) X = 12 402.8 nm In the third spectrum, how far is line D from the reference line? What is the observed wavelength of line D in spectrum 3? (410.1-x*s) X = 10 384.1 Spectrum and Line Rest Wavelength Shifted Wavelength Inferred Velocity in km/s Spectrum 2, Line A 656.3 nm 645.9 nm -4830.4 Spectrum 2, Line B 486.1 nm 479.6 nm -4065.9 Spectrum 2, Line C 434.0 nm 431.4 nm -1808.1 Spectrum 2, Line D 410.1 nm 407.5 nm -1914.1 Spectrum 3, Line A 656.3 nm 599.1 nm -28 643.0 Spectrum 3, Line B 486.1 nm 449.7 nm -24 282.9 Spectrum 3, Line C 434.0 nm 402.8 nm -23 237.3 Spectrum 3, Line D 410.1 nm 384.1 nm -20 307.2