Answer:
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Explanation:
J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged soup
1/2=5750 years, 1/2(1/2)=1/4, (1/2)(1/2)(1/2)=1/8, (1/2)(1/2)(1/2)(1/2)=1/6
4 halflives have passed so 4(5750)=23000 years since the tree was chopped down
1000000 atoms (1/2)=500000 atoms(1/2)=250000(1/2)=125000(1/2)=62500 atoms would remain in the wood after 4 halflives
Dinosaurs became extinct around 62 million years ago, so if 14C's half life has a value of 5750 years, it would be gone or in such small amounts that dating would be ineffective today.
As Potassium decays into Argon in 1.3 billion years, apart from volcanic activity, it would enable geologists to effectively date things that are really, really, really old.
Answer:
When the fuel is burnt, the hot gas rushes out of the rocket due to the great heat and pressure produced by the release of chemical energy in burning. Energy transfer is the movement of energy from one location to another. Energy transformation is when energy changes from one type to another.
Explanation:
Heisenberg's <em>Uncertainty Principle</em> gives a relationship between the standard deviation of an object's position and its momentum.
where
the standard deviation of the object's <em>momentum,</em>
the standard deviation of the object's <em>position, </em>and
the Planck's constant.
By definition, the momentum of the electron equals the product of its mass and velocity.
Assuming that measurement of the mass of the electron 
is accurate. It is assumed to be a coefficient of constant value. The <em>standard deviation</em> in the electron's velocity is thus directly related to that of its mass. That is:
from the question;
Convert the unit of the Planck's constant to base SI units (kg, m, s, etc.) if it was provided in derived units such as joules. Doing so would allow for a dimension analysis on the accuracy of the result.
Apply the <em>Uncertainty Principle</em>:
.
Dimensional analysis:
resembles the <em>standard deviation</em> of a position measurement. It is expected to have a unit of meter, which is the same as that of position.
