Answer Happy

60 Part II: Blackbody Curves Different colors of light are manifestations of the same phenomenon but have different wavelengths. For example, red light has a wavelength between 650 nm and 750 nm, whereas violet light has a shorter wavelength between 350 nm and 450 nm. Stars also give off light at wavelengths outside the visible part of the spectrum, as seen in Figures 2a, 2b, and 2c. The two most important features of a star's spectral curve (also known as a blackbody curve) are: . its maximum height or peak-where the energy output is greatest; and the corresponding wavelength at which this peak occurs which indicates the star's temperature. If the peak occurs at a long wavelength, the star is cooler than a star that gives off most of its light (peaks) at a short wavelength. For example, if Star E and Star F are the same size and temperature, they will have identical blackbody curves. However, if Star F is the same size as Star E, but is cooler, then its energy output is less at all wavelengths and the peak occurs at a longer wavelength (toward the red end of the spectrum). Visible Range Star E 8000* Blackbody Radiation Star F 4000°K VIRGYOR Figure 2a S Wavelength Visible Range Star E 8000 2013 Pearson Education, Inc. Star C VIBGYOR Figure 2b Wavelength Star E 8000 7) Which star gives off more blue light? Explain your reasoning. 8) Which star looks redder? Explain your reasoning. Visible Range Star D Use Figure 2a to answer Questions 6-9. Assume Stars E and F are the same size. 6) Which star gives off more red light? Explain your reasoning. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬ VIBGYOR Wavelength Figure 2c saloo EXW (F An desain is inclop terw to LECTURE-TUTORIALS FOR INTRODUCTORY ASTRONOMY
Blackbody Radiation 9) Two students are discussing their answers to Question 8. Student 1: Student 2: Star E looks redder because it is giving off more red light than Star F. I disagree, you're ignoring how much blue light Star E gives off. Star E gives off more blue light than red light, so it looks bluish. Star F gives off more red than blue, so it looks reddish. That's why Star F looks redder than Star E. Do you agree or disagree with either or both of the students? Explain your reasoning. 10) Using the blackbody curves shown in Figure 2b, for each characteristic listed in the table below circle the correct response in the column to the right. Characteristic Peaks at a longer wavelength ourface Star E Star E 61 Star C Star C Responses They peak at the same wavelength They have the same surface temperature Neither looks red