After World War II, the U.S. Government spent two decades investigating UFOs because they
A) were themselves developing new types of aircraft and used the official investigation as a cover-up
B) thought that they might be new types of aircraft being developed by the Soviet Union
C) knew that UFOs were alien craft and used the official investigation as a cover-up
D) were afraid that an alien civilization was in the process of invading the Earth
B
You might also like to view...
The slow ________ of Mercury was first determined using radar signals sent from Earth
Fill in the blank(s) with correct word
Silver has a Fermi level (energy) of 5.5 eV. At 0 K, at what speed would the electrons be moving if they had kinetic energy equal to the Fermi energy?
(This speed is known as the Fermi speed.) (mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J • s) A) 1100 km/s B) 1400 km/s C) 2.2 km/s D) 1.0 km/s E) 3.5 km/s
What would the concentration of H3O+ be if the concentration of OH- was 1 × 10-1M?
[H3O+] × [OH-] = Kw = 1 × 10-14 A) 1 × 10-3 B) 1 × 10-2 C) 1 × 10-4 D) 1 × 1013 E) none of the above
A double slit illuminated with light of wavelength 588 nm forms a diffraction pattern on a screen 11.0 cm away. The slit separation is 2464 nm. What is the distance between the third and fourth bright fringes away from the central fringe?
A) 23.9 cm B) 5.96 cm C) 5.59 cm D) 2.63 cm