Current searches for extraterrestrial intelligence use radio telescopes at wavelengths
a. which must be shorter than the local wavelengths emitted by Earth's atmosphere
b. which must be longer than the radio wavelength "noise" naturally emitted by our galaxy
c. Both conditions "a" and "b" above must be fulfilled.
d. Wrong! Visual light wavelengths are used because they are blocked by dust between the stars.
C
You might also like to view...
The dynamo effect is believed to produce the ____________________ of the sun
Fill in the blank(s) with correct word
In a Young's double-slit experiment, by how many wavelengths do the paths from the slits to the screen differ for the m = 3 and the m = 8 minima?
a. 10 b. 2.5 c. 5 d. Some other value than those given since this is for destructive interference.
Which of the following is true?
A. Energy is measured in joules, and power is measured in calories. B. Power is energy divided by time. C. Batteries release energy, but TNT releases power. D. Power signifies a very large value of energy. E. All of the above.
The Tully-Fisher relation exists between the galaxy's luminosity and its
A) age. B) mass. C) size. D) rotation. E) color.