Final answer:
The promotional material about radio waves historically has proven to be scientifically accurate, with the Viking experiments, discovery of cosmic microwave background radiation, and the first detection of cosmic radio waves from the Milky Way helped in supporting Einstein's relativity and the Big Bang theory.
Step-by-step explanation:
The promotional material about radio waves was scientifically accurate in various historical instances. For example, the Viking experiments on Mars confirmed Einstein's theory of general relativity, showing the effects of gravity on the propagation of radio waves through a test which observed a delay in their transmission due to passing near the Sun. Secondly, the discovery of cosmic microwave background radiation by Arno Penzias and Robert Wilson, as a form of faint static detectable from all directions, indicated a uniformity in cosmic radiation, supporting the Big Bang theory. Lastly, Karl G. Jansky's experimentation with antennas for long-range communication led to the first detection of cosmic radio waves from the Milky Way Galaxy, proving their extraterrestrial origin. These occurrences underline the reliability of claims about the behavior and detection of radio waves.
In one example, a radar astronomer claims to have beamed radio waves to Jupiter and received an echo 48 minutes later. Considering the vast distance between Earth and Jupiter, which is many millions of miles, and the speed at which radio waves travel (the speed of light), this claim is plausible, as it would take a significant amount of time for the waves to travel to Jupiter and back.
Grote Reber's work also exemplified the scientific accuracy regarding astronomical radio waves. He built antennas to detect cosmic radio waves and conducted sky surveys, enhancing understanding of celestial sources of radio waves, such as stars and galaxies.