Above about 80 km, the Sun's radiation ionizes the gases. What is this part of Earth's atmosphere called?
A) The troposphere
B) The stratosphere
C) The mesosphere
D) The ionosphere
E) The magnetosphere
D
You might also like to view...
The Trojans, Greeks, and Hildas are in orbit around
A) the Sun. B) Jupiter. C) Saturn. D) Uranus.
In the ground state, the quantum numbers (n, ?, m , ms) for hydrogen are, respectively,
A) 1, 1, 1, 1. B) 1, 0, 0, 0. C) 1, 0, 0, ±1/2. D) 1, 1, 1, ±1/2. E) 1, 1, 0, ±1/2.
Neutral hydrogen may be detected between the stars because it emits ________
Fill in the blank(s) with correct word
What is hypothesized to have caused a sudden inflation of the early universe?
A) the annihilation of matter and antimatter B) the separation of the electromagnetic and weak forces C) the "freezing out" of the strong force from the GUT force D) the energy released in the fusion of protons and neutrons to produce helium E) giant quantum fluctuations