What is true of an element of atomic number 15 that has an isotope of mass number 32? (There could be more than one correct choice.)
A) the number of protons in the nucleus is 15.
B) the number of neutrons in the nucleus is 17.
C) the number of protons in the nucleus is 32.
D) the number of neutrons in the nucleus is 15.
E) the number of nucleons in the nucleus is 47.
A, B
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A radio galaxy whose lobes are swept back as if forming a tail. This probably indicates that:
A) this is evidence for intergalactic matter. B) the galaxy is about to evolve into a spiral. C) the galaxy is isolated, not part of a cluster. D) the galaxy is moving towards Earth. E) there must be another galaxy nearby.
Death Valley in California receives many German tourists. When you convert a summer temperature reading of 130°F to the Celsius scale they use at home, you find that the Celsius temperature is about
a. 26°C. b. 54°C. c. 72°C. d. 176°C e. 327°C.
The standard unit of volume in the
International System is a) cubic meter b) milliliter c) liter d) centimeter
What is a magnetosphere?
A) a region of space around a planet in which the planet's magnetic field can trap charged particles B) the layer of a planet in which its magnetic field is generated C) the uppermost layer of any planetary atmosphere D) the region in a planet's atmosphere in which auroras occur