D because at some points the sun is closer making it hot...Then it is further away making it colder.
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A technique in which the muscles are stretched by an outside force is called passive stretching.
For radioactive materials with short half-lives, you use a very sensitive calibrated detector to measure how many counts per second it is producing. Then using the exact same set up you do the same at a latter time. You use the two readings and the time between them to determine the half-life. You don’t have to wait exactly a half-life, you can do the math with any significant time difference. Also, you don’t need to know the absolute radioactivity, as long as the set up is the same you only need to know fraction by which it changed.
For radioactive materials with long half-lives that won’t work. Instead you approach the problem differently. You precisely measure the mass of a very pure sample of the radioactive material. You can use that to calculate the number of atoms in the sample. Then you put the sample in a counter that is calibrated to determine the absolute number of disintegrations happening in a given time. Now you know how many of them are disintegrating every second. You use the following equations:
Decays per Second = (Number of Atoms) x (Decay Constant)
Half-life = (Natural Log of 2) / (Decay Constant)
And you can calculate the half-life
Hope it helps :)
Mark it as brainliest pls :)
Answer:
I'm not sure but the answer would be 1.2
Answer:
The correct answer is "The epicenter was either at location 1 or 2".
Explanation:
At least the information of three recording stations are necessary to undoubtedly calculate the location of an earthquake epicenter. The point at which the three circles overlap will mark the location of the epicenter. In this case we only have the seismograph data from two recording stations, therefore is not possible to determine the location of the epicenter. However, we can determine that the epicenter was either at location 1 or 2, the two points at which the circles overlap. I attached the missing figure.
