A beam of light is polarized in a vertical plane and has an intensity I0. The beam passes through an ideal polarizer and then through an ideal analyzer whose axis is set horizontally
If the axis of the polarizer is set at 60° with the vertical, what is the ratio of the intensity of the final beam to I0? A) 0.19
B) 0.25
C) 0.31
D) 0.37
E) 0.43
A
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The determination of the composition of a material by bombarding it with neutrons and monitoring the emitted radiation is
a. nuclear fission analysis. b. nuclear fusion analysis. c. neutron activation analysis. d. nuclear emission analysis. e. beta decay analysis.
Why do astronomers conclude that the spiral arms are places of active star formation?
What will be an ideal response?
All the following statements about Mars are true. Which one might be the cause of a significant loss of atmospheric gas to space?
A) The rock on Mars is probably red because of chemical reactions with oxygen that had been released into the atmosphere through the outgassing of water molecules. B) Mars lost its global magnetic field, leaving the atmosphere vulnerable to the solar wind. C) The axis tilt of Mars is thought to change significantly with time. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.