Individual galaxies generally have higher mass-to-light ratios than clusters of galaxies
Indicate whether the statement is true or false
FALSE
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Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBI telescope c. an x-ray telescope d. a radio telescope e. none of the above
A stone is thrown straight up. What is its acceleration on the way down?
What will be an ideal response?
A 15-kg mass, attached to a massless spring whose force constant is 2 500 N/m, has an amplitude of 4 cm. Assuming the energy is quantized, find the quantum number of the system, n, if En = nhf
a. 1.5 × 10^33 b. 3.0 × 10^33 c. 4.5 × 10^33 d. 5.4 × 10^33 e. 1.0 × 10^33
Treating water with chlorine or ozone during water purification is an example of
A) a physical change. B) a chemical reaction. C) ion exchange. D) a solid dissolving in a liquid. E) only a and b