Giant spirals are the largest galaxies in the Universe
a. True
b. False
Indicate whether the statement is true or false
False
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Study this H-R diagram. Which of the following stars has (or had) the longest hydrogen fusing lifetime? (The red arrows help you locate these stars on the diagram.)
A) Barnard's star B) Alpha Centauri B C) Betelgeuse D) the Sun
What range of astronomical distances can we currently measure using Hubble's law?
What will be an ideal response?
Order the following situations according to the magnitude of the magnetic field at the point P. Order from highest to lowest
1.ABCD
2.ADBC
3.BDAC
4.CADB
5.DABC
6.None of the above
A sample containing 4.0 × 1018 atoms of a radioactive isotope decays with a half-life of 2.3 years. How many undecayed atoms are left after 3.7 years?
A) 2.5 × 1018 B) 1.7 × 1018 C) 1.3 × 1018 D) 1.1 × 1018