Acrux has an MV = –4.2 and an mV = 0.81 . Therefore, Acrux is actually brighter than we perceive it to be
a. True
b. False
Indicate whether the statement is true or false
True
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One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s (3 × 105 km/s). How far is 1 light-year?
A) 3 × 105 km B) 1.8 × 107 km C) 1.08 × 109 km D) 9.46 × 1012 km
Earth has gone in and out of numerous ice ages over the past couple million years. Which of the following was generally true during all those ice ages?
A) The atmospheric carbon dioxide concentration was much higher than it is today. B) The atmospheric carbon dioxide concentration was much lower than it is today. C) The continents were closer together than they are today. D) The continents were farther apart than they are today. E) There were much larger mammals than there are today.
A steel pipe (E 5 190 GPa, ? 5 14 3 1026/°C, column d2 5 82 mm, and d1 5 70 mm) of length L 5 4.25 m is subjected to a temperature increase DT. The column is pinned at the top and fixed at the bottom. The temperature increase at which the column will buckle is approximately:
(A) 36 8C
(B) 42 8C
(C) 54 8C
(D) 58 8C
The transition in atomic hydrogen that gives the longest wavelength in the visible spectrum is
A. n = 3 to n = 1. B. n = 2 to n = 1. C. n = 4 to n = 1. D. n = 3 to n = 2. E. n = 4 to n = 2.