In the Bohr model of the hydrogen atom the state of the atom is characterized by a single quantum number n
Indicate whether the statement is true or false
TRUE
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Ancient astronomers thought the heavens were perfect circles, spheres, and unblemished
a. True b. False Indicate whether the statement is true or false
Why is it summer in the Northern Hemisphere when it is winter in the Southern Hemisphere?
A) The Northern Hemisphere is "on top" of Earth and therefore receives more sunlight during the Northern Hemisphere summer. B) The Northern Hemisphere is tilted away from the Sun and receives more indirect sunlight during the Northern Hemisphere summer. C) The Northern Hemisphere is tilted toward the Sun and receives more direct sunlight during the Northern Hemisphere summer. D) It isn't: both hemispheres have the same seasons at the same time. E) The Northern Hemisphere is closer to the Sun than the Southern Hemisphere during the Northern hemisphere summer.
For electrical safety,
a. electrical shocks caused by 1 A of current are of no concern. b. fuses or circuit breakers are wired in series in circuits. c. fuses larger than the rated value can be placed in a circuit. d. fuses and circuit breakers are wired in parallel in circuits.
Which element represented most of the atoms in the early Universe?
a. helium b. hydrogen c. oxygen d. carbon e. nitrogen