The entropy of an isolated system must be conserved, so it never changes
A) True
B) False
B
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Which of the following is NOT a solution to the Fermi Paradox?
A) no one is interested or able to communicate B) we are unable to detect their communications C) we are not interested in communicating D) no one is out there
What frequency must a photon have if it is to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state?
A) 3.06 × 1014 Hz B) 6.16 × 1014 Hz C) 4.11 × 1014 Hz D) 5.20 × 1014 Hz E) 9.24 × 1014 Hz
A 10 microcoulomb charge is placed at the origin and a 20 microcoulomb charge is placed on the x-axis at x = 40 cm. If an electron is placed on the y-axis at y = 30 cm, what is the magnitude of the force it will experience?
A) 0.615 × 10-12 N B) 2.46 × 10-13 N C) 4.92 × 10-13 N D) 1.23 × 10-13 N E) 2.46 × 10-14 N
The ancient Greeks get a lot of attention for their contributions to science because ________
A) they were the only ancient culture that kept written records of their astronomical observations B) they were the first people to realize that Earth is a planet orbiting the Sun C) they were the first people known to try to explain nature with models based on reason and mathematics, without resort to the supernatural D) the books of every other culture were lost in the destruction of the library of Alexandria