Americium-243 has a decay constant of 9.39 × 10-5years-1. How long will it take for a sample of americium to lose one-third of its nuclei?
A)
2960 s
B)
10.6 × 103 years
C)
4.32 × 103 years
D)
6.44 × 103 years
E)
7.84 × 103 years
C
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The Yerkes refracting telescope has a 1-m-diameter objective lens of focal length 20 m and an eyepiece of focal length 3.5 cm. What is the magnification of the planet Mars as seen through this telescope?
a. 140 b. 280 c. 570 d. 1,000 e. 35
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In contrast to the photosphere's continuum, the spectrum of the chromosphere is dominated by ________ lines
Fill in the blank(s) with correct word
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A) h/4 B) h/2 C) 2h D) h E) 4h