Multiple Choice
The 1420 MHz (21 cm) radio line generated by neutral hydrogen atoms is a good choice for interstellar communications because
A) it is the easiest radio frequency to generate
B) it is the only radio frequency that is not blocked by interstellar matter
C) all intelligent civilizations should be aware of its universal significance and would probably also think of sending and receiving signals at this frequency
D) it is the only frequency to which radio telescopes can be tuned
Correct Answer:
Verified
Correct Answer:
Verified
Q13: The Drake equation allows us to estimate
Q14: Which of the following cases in the
Q15: An organism with an Encephalization Quotient (EQ)
Q16: Currently in the USA, SETI programs are
Q17: Optical SETI is useful for<br>A) focused communication
Q19: The main problem with early attempts to
Q20: About 90% of UFO sightings<br>A) are hoaxes<br>B)
Q21: In principle, the Drake equation should enable
Q22: If we were to intercept a signal
Q23: Which of the following factors in the