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Why After three half-lives what fraction of a radioactive sample remains?
The fraction that remains is 1/8.
What is a chronograph movement as apposed to an automatic or quartz movement?
Typically, "Chronograph" does not describe the movement of a watch, but rather the "complication" of a watch's movement. A watch's complication is anything that provides advanced functionality, such as moon-phase display or perpetual calendar. In this case, "Chronograph" refers to a watch that is capable of stopwatch functionality in addition to timekeeping. Usually this is built into three separate dials for hours, minutes, and seconds. Such a watch can have any movement type (automatic, quartz), and can also have several complications at once. Note that digital watches with stopwatch functionality are considered "digital chronographs", and there is also the "analog-digital chronograph". Some online retailers confuse complications with the actual movement (putting "chronograph" for the movement), so further research should be done to determine whether the watch actually uses quartz or automatic movement.
How many minutes does a tornado last?
Usually less than five minutes and often just a few seconds. Strong tornadoes can last for over 20 minutes, sometimes over an hour. The longest a tornado has been known to last was three and a half hours.
How do the hands move on the clocks?
A clock moves clockwise with three hands; one that moves every second, sixty seconds, and 60 minutes.
What is pen dosimeter?
A pen dosimeter is a dosimeter the size and shape of a pen. In many cases they are radiation quartz fiber dosimeters made during the cold war for civil defense workers in the case of a nuclear attack. Of these the CD V-742 is the most common with over three million being produced.
What percentage of the halite remained after three minutes?
5
What is the origin of quartz?
Quartz is a naturally occurring mineral found in all three rock types.
Identify three minerals that are normally found with quartz in samples of andesite rock?
quartz garnet olivine
Does quartz split in three directions?
No, quartz doesn't have distinctive cleavage, it will tend to break with a conchoidal fracture.
How can the mineral quartz be an igneous rock?
Quartz is a rock-forming mineral--and can be found in all three rock types. There is no igneous rock formation that is exclusively composed of the mineral quartz.
What group of rock does quartz belong to?
None of them. Quartz is a mineral, not a rock type. Quartz could be found among any of the three classifications of rock--igneous, sedimentary, or metamorphic.
Does quartz have three prominent cleavage directions developed at right angles to one another so that it breaks into cubes?
No, quartz has no cleavage.
Why doesn't quartz have cleavage?
In quartz, a three-dimentional framework is developed through the complete sharing of oxygen by adjacent silicon atoms. Thus, all of the bonds in quartz are of the strong silicon-oxygen type. Consequently, quartz is hard, resistant to weathering, and does not have cleavage!
Is quartz igneous?
Theoretically yes, though any given sample of quartz may contain inclusions (non-quartz stuff trapped inside) making it heterogeneous.
What fraction of a sample remains after three half lives?
An eighth remains.
What is three-eights in percentage?
three-eights in percentage = 37.5%
How many quartz in 3 cups?
Three cups = 3/4 quart.
