lab06

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Durham Technical Community College *

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AST 151

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Astronomy

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Apr 3, 2024

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docx

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2

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Save this template using the file name convention for this course … last name, first name, lab number (e.g., “newtoni-lab06”). Bright Objects Table 1 Wavelength Temperature Wavelength (nm) Region of Spectrum Kelvin Fahrenheit Sirius A 293 Ultraviolet- Infrared 9900 17360.33 Sun 500 Ultraviolet- Infrared 5800 9980.33 Light Bulb 966 Visible-Infrared 3000 4940.33 Human Vision Shortest wavelength: nm 383 Longest wavelength: nm 777 Questions 1) Which two of the three objects in Table 1 have their peak intensity outside the visible part of the spectrum? Answer : Sirius A and the Sun 2) We can see all three objects clearly in the visible part of the spectrum, even though the peak intensity might lie outside that region. Why is this so? Answer : They release light at different times from peak to peak, so we can see more than just their peak. 3) How is the wavelength of the most intense emission related to surface temperature? Answer : The peak point leans further toward ultraviolet wavelengths at increasing temperatures. 4) At what wavelength does the Sun emit its most intense radiation? The Sun usually appears yellow to the human eye. What is the wavelength for yellow light? Are these the same or not? How is this related to the normal limits of human vision?
Answer : Its maximum wavelength is 500 nm, which resembles bright seafoam green on the visible light graph. At 566 nm, yellow starts, and ends at 606 nm. So it is not the same. 5) Astronomers searching for planets orbiting other stars are particularly interested in finding Earthlike planets in the habitable zone around stars, where liquid water could theoretically exist. What are major problems astronomers face in observing such planets directly? Answer : While we are unable to find life on Earth-sized planets or identify what is on their surfaces, we are able to identify the elements of their atmospheres and determine whether they are livable as well.
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