What role did Frank Drake play in SETI?
What will be an ideal response?
Frank Drake developed the equation that attempts to provide the number of technological, intelligent civilizations now present in the Galaxy by breaking it up into 7 different factors that might be individually analyzed.
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Which of the following statements about parallax is not true?
A) The existence of stellar parallax is direct proof that Earth orbits the Sun. B) You can demonstrate parallax simply by holding up a finger and looking at it alternately from your left and right eyes. C) Ancient astronomers were unable to measure parallax and used the absence of observed parallax as an argument in favor of an Earth-centered universe. D) Measurement of stellar parallax allows us to determine distances to nearby stars. E) The technique of stellar parallax was used by Hubble to determine that the Andromeda Galaxy (M 31 ) is about 2 million light-years away.
A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ?, what is the magnitude of the induced current?
a. 0.70 A b. 0.60 A c. 0.50 A d. 0.80 A e. 0.20 A
Electrons are accelerated through a potential difference of 90.0 kV and directed at a tungsten target to produce x-rays. What is the cutoff frequency in the x-ray spectrum produced?
a. 
b. 
c. 
d. 
e. 
In positron decay, the number of protons in the nucleus is
A) decreased by 1. B) decreased by 2. C) increased by 1. D) increased by 2. E) remains unchanged.