Space telescopes looking for transiting planets look for small drops in brightness; these drops are:
A) less than 10%.
B) less than 1%.
C) less than 0.01%.
D) less than 0.0001%.
E) any size.
C
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The observed distribution of matter in the Universe is best understood as being caused by ____
a. clumping of dark matter in the early Universe causing clumping of normal matter b. clumping of normal matter in the early Universe causing clumping of dark matter c. simultaneous clumping of normal and dark matter d. large variations in the intensity of the cosmic microwave background e. homogenous expansion of normal and dark matter
During the period each year when we see Mars undergoing apparent retrograde motion in our sky, what is really going on in space?
A) Earth and Mars are getting closer together. B) Mars is moving around the Sun in the opposite direction from which Earth is moving around the Sun. C) Earth is catching up with and passing by Mars in their respective orbits. D) Earth and Mars are on opposite sides of the Sun.
According to Wien's Law, a(n) ____
a. hotter object will emit more short wavelength (bluer) radiation b. hotter object will emit more long wavelength (redder) radiation c. cooler object will produce less photons d. cooler object will produce more photons e. object will produce the same number of photons at different temperatures
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2. What is the magnitude of the electric field at any point not on either surface?
A. 1.1 N/C B. 5.6 N/C C. 7.9 N/C D. 3.8 N/C E. 4.0 N/C