Why is Titan considered a good candidate for life?
A) It has lakes and rivers of liquid methane and ethane that could support life as water does on Earth.
B) Cassini measurements suggest it has an ocean of liquid water beneath its surface.
C) There is evidence for several volcanic cones that likely erupt liquid water that is below Titan's frozen crust.
D) All of the above
D
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A spectrograph spreads out light according to ____ to form a spectrum
a. wavelength b. frequency c. interference d. aberration e. grating
In a folded sequence of rocks we find older rocks at the axis of the fold and younger rocks away from the fold axis. The fold is
A) called a syncline. B) called an anticline. C) plunging. D) tilted.
Why do hydrogen gas clouds glow red?
A: Remnants of ancient supernova explosions, they've cooled from white hot to reddish over the course of millions of years. B: Their light is highly red-shifted because of the high speeds with which the gas clouds are moving. C: They're members of the Cool Cosmic Clouds Party (CCCP). D: Decay of trace radioactive elements within them heats the clouds until they glow red. E: Electromagnetic radiation from nearby stars heats the clouds until they glow red.
If the half-value layer for a particular energy gamma ray is 0.40 cm of lead. What fraction of a beam of these photons will penetrate 1.00 cm of lead?
A. 0.40 B. 0.18 C. 0.067 D. 0.60 E. 0.72