What would happen to Earth's temperature if Earth were more reflective?
a. It would go up.
b. It would go down.
c. It wouldn’t change.
Ans: b. It would go down.
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By mass, the interstellar medium in our region of the Milky Way consists of
A) 70% Hydrogen, 30% Helium. B) 70% Hydrogen, 28% Helium, 2% heavier elements. C) 70% Hydrogen, 20% Helium, 10% heavier elements. D) 50% Hydrogen, 50% Helium. E) 50% Hydrogen, 30% Helium, 20% heavier elements.
Radioactive Decay: Time (days)026111930Counts per Minute1000899726556356200In a laboratory accident, a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and obtain the data shown in the table. The accident occurred at time t = 0 days. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 16 counts per minute. Of the choices listed, which one is the earliest time after the accident that workers could safely return?
A. 77 days B. 90 days C. 102 days D. 65 days E. 48 days
The four visible colors emitted by hydrogen atoms are produced by electrons:
a. that start in the ground state. c. that end up in the level with n = 2. b. that end up in the ground state. d. that start in the level with n = 2.
On a large scale, we find the universe to have voids and ________ structure
Fill in the blank(s) with correct word