Given the following energy profiles, which of the following reactions is endothermic?
A) a
B) b
C) c
D) d
E) none of the above
Answer: D
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How do scientists estimate the age of the universe?
A) They look up the answer in a book or they Google it. B) They measure the abundances of radioactive elements in meteorites, and use their half-lives to calculate the age of the meteorites, which are the oldest solids in the solar system. C) They measure the speeds and distances of galaxies, and calculate the time it took for them to travel that distance (away from us). D) They make a guess: no one really knows how old the universe is. E) They measure how fast the Sun is losing energy, and how much energy it has left to lose.
For an orbital quantum number of 2, the magnetic quantum number can take on what allowed values?
What will be an ideal response?
Given how many times intelligent civilizations could have appeared over the universe's history, it is most likely that if other civilizations exist, they will
A) be slightly less advanced than us B) be much less advanced than us C) have about the same level of technology as us D) be much more advanced than us
Light of wavelength 610 nm is incident on a slit 0.20 mm wide and the diffraction pattern is viewed on a screen that is 1.5 m from the slit. What is the width on the screen of the central maximum?
A) 0.34 cm B) 0.68 cm C) 0.92 cm D) 1.2 cm E) 1.5 cm