How does Drake define a technological civilization?
A) one that can get into space
B) one that can communicate over interstellar distances
C) one that has a written language
D) one that can construct metal tools
E) one that can have the intelligence not to destroy itself
B
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A person's eye lens is 2.8 cm from the retina, and his near point is at 25 cm. What must be the focal length of his eye lens so that an object at the far point of the eye will focus on the retina?
A) -2.8 cm B) 2.8 cm C) -2.4 cm D) 2.4 cm E) 2.2 cm
Molecular Rotation: Estimate the maximum rotational energy (in electron-volts) for a free and freely-spinning diatomic hydrogen molecule in the L = 2 quantum state. The equilibrium separation for the atoms in the H2 molecule is 0.075 nm. (1 eV = 1.60 × 10-19 J, mproton = 1.67 × 10-27 kg, h = 6.626 × 10-34 J ? s)
A. 0.011 eV B. 0.022 eV C. 0.033 eV D. 0.044 eV
Which of the following describes an experiment that demonstrates that light is a wave?
A) If you let light pass through a narrow "slit" formed by your fingers, you can detect the energy transfer as the light passes through your fingers. B) If you let light pass through a narrow "slit" formed by your fingers, you can see an interference pattern. C) If you allow light from a transparency projector to hit a small container full of water placed in front of the projector, you can detect an energy transfer as the light enters the water. D) a mystical experiment in which the instructor pulls a cosmic toad out of a baseball cap. E) If you allow light from a transparency projector to hit a small container full of water placed in front of the projector, you can see an interference pattern in the water.
Briefly explain the meaning of each term in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow. What will be an ideal response?