homework4 - Name Astronomy 161 Introduction to Solar System...

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Name _________________________ Astronomy 161 – Introduction to Solar System Astronomy Winter Quarter 2008 – Prof. Martini Homework #4 Due Friday, February 22 in class Instructions Answer the following questions by circling the correct answer. Each question has equal weight. No late homework will be accepted. 1. Meteors heat up significantly due to friction caused by the Earth’s atmosphere. They can get as hot as 1800 K and many completely burn up before they hit the ground. If the meteor were a perfect blackbody, what would be the peak wavelength (in units of nm) of its electromagnetic radiation? (Hint: use Wien’s Law) a) 150nm b) 500nm c) 900nm d) 1600nm e) 1800nm 2. You seal a sample of pure radioactive Eggium into a jar and leave it alone for 27 days. After 27 days you open the jar and find that 7/8 of the Eggium has changed into Chickenium. What is the half-life of Eggium in days? a) 1 day b) 3 days c) 9 days d) 13.5 days e) 27 days
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