The Bohr theory was developed to explain which of these phenomena?
a. The photoelectric effect
b. Line spectra
c. Quantum numbers
d. X-rays
b
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Why is Saturn almost as big as Jupiter, despite its smaller mass?
A) Jupiter's greater mass compresses it more, thus increasing its density. B) Saturn's rings make the planet look bigger. C) Saturn is further from the Sun, thus cooler, and therefore less compact. D) Saturn has a larger proportion of hydrogen and helium than Jupiter, and is therefore less dense. E) Jupiter's strong magnetic field constrains its size.
Why is there a lower end to the main sequence?
What will be an ideal response?
Technically, its not mass that causes the curvature of spacetime, but
A) mass density. B) energy density. C) thermal mass. D) thermal mass fluctuations.
A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building
What is the minimum amount of work that the worker did in lifting the bucket? A) 3.92 kJ B) 400 J C) 560 J D) 4.08 kJ E) 160 J