The sky is blue because of
a. interference
b. diffraction
c. scattering
d. dispersion
e. polarization
C
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Assuming the impact hypothesis is correct, in what way(s) was the impact important to our existence on Earth today?
A. Water from the impact-generated tsunami explains why regions of North America are agriculturally fertile today. B. The iridium and other metals brought to Earth by the impact have proven to be very important for modern electronic devices. C. Prior to the impact, early humans had been threatened by dinosaurs, but after the impact they were free to develop civlization. D. It seems unlike that we would have evolved by now without the extinctions caused by the impact.
When did scientists first detect gravitational waves from mergers of compact objects (pairs of neutron stars or black holes)?
A) 2015 B) 1543 C) 1990 D) Gravitational waves have not yet been detected, though scientists hope to detect them soon.
Points A [at (2, 3) m] and B [at (5, 7) m] are in a region where the electric field is uniform and given by 
N/C. What is the potential difference VA?VB?
A. 33 V B. 27 V C. 30 V D. 24 V E. 11 V
Wave Characteristics: A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm. What is the highest frequency associated with this portion of the spectrum? (c = 3.00 × 108 m/s)
A. 1.50 × 1014 Hz B. 7.50 × 1013 Hz C. 7.50 × 1014 Hz D. 7.50 × 1015 Hz E. 1.50 × 1015 Hz