Figure 25-1
Examine the accompanying figure (Figure 25-1). Which portion of the radio window astronomers use to search for extraterrestrial communication?

Question

Figure 25-1 
Examine the accompanying figure (Figure 25-1). Which portion of the radio window astronomers use to search for extraterrestrial communication?

Quizplus · Accepted Answer

Astronomers use the “waterhole” frequency range, which falls between the low frequency range of radio waves emitted by hydrogen and the high-frequency range of radio waves absorbed by hydroxyl (OH) ions. This range is represented by the narrow band between Peaks C and D in the figure, which includes the 1.42 GHz frequency emitted by hydrogen atoms and the 1.6 GHz frequency absorbed by hydroxyl ions. Therefore, option C is the correct choice.

Figure 25-1 Examine the Accompanying Figure (Figure 25-1). Which Portion of the Portion