Lab 08

Name: Date: Lab 08: Blackbody Spectrum Save this template using the file name convention for this course … last name, first name, lab number (e.g., “newtoni-lab08”). Bright Objects Table 1 Wavelength Temperature Wavelength (nm) Region of Spectrum Kelvin Fahrenheit Sirius A 291nm Ultraviolet 9950K 17,450.3 F Sun 590nm Visible 5800K 9,980.3 F Light Bulb 950nm Infrared 3050K 5,0303 F Human Vision Shortest wavelength: 291nm Longest wavelength: 950nm 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 Light Bulb 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 still have to go through visible light, which is why I think this. 3) How is the wavelength of the most intense emission related to surface temperature? Answer : The wavelength will be longer the less heat it contains. 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?