Radioactivity Basics: In the radioactive decay equation 
Po? ? 
Po + X, what is X?
Fill in the blank(s) with the appropriate word(s).
gamma ray
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In Young's double-slit experiment, light coming from each slit arrives in phase at the first maximum on either side of the central bright fringe
Indicate whether the statement is true or false
Hot Jupiters were a surprise to astronomers. What is the current explanation for their existence?
A) Jupiters actually can form close to the host star, since they do not require as much hydrogen compounds and ice as originally thought. B) The temperature of the hot Jupiters is highly uncertain, so they might not be as hot as the astronomers say. C) Jupiters are supposed to form far away from their host star, and then they migrate closer through gravitational interactions with the protoplanetary disk. D) Jupiters form as a companion to the host star, but fail to become actual stars themselves because they are not massive enough.
A wave with a frequency of 5 Hz will have a period of ______________ s
Fill in the blank(s) with correct word
The three cubes represent three stages in a computer simulation of the formation of protogalactic clouds; they represent a region about 500 million light-years across. Which of the following statements about this model is true?
A) Although the gas looks uniform in the first frame, the model assumes there were small regions with slightly higher densities than other regions. B) The gas in the third frame looks disorganized, but the model indicates that all this gas soon became the spiral arms of a large spiral galaxy. C) Although the gas in the three frames looks fairly stationary, the model assumes that the entire blob of gas must have been rotating rapidly. D) Although the model shows only visible gas, it assumes that there were supermassive black holes randomly distributed throughout the universe.