The radius of earth is 6,370,000 m. Express this measurement in km in scientific notation with the correct number of significant
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This problem uses the relationships among current I, current density J, and drift speed vd. We are given the total of electrons that pass through the wire in t = 3s and the area A, so we use the following equation to to find vd, from J and the known electron density n, so:
<span>The current I is any motion of charge from one region to another, so this is given by:
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The magnitude of the current density is:
Being:
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Finally, for the drift velocity magnitude vd, we find:
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Notice: The current I is very high for this wire. The given values of the variables are a little bit odd
<span>The current I is any motion of charge from one region to another, so this is given by:
</span>
The magnitude of the current density is:
Being:
<span>
Finally, for the drift velocity magnitude vd, we find:
</span>
Notice: The current I is very high for this wire. The given values of the variables are a little bit odd
To solve this problem we will use the heat transfer equations, to determine the amount of heat added to the body. Subsequently, through the energy ratio given by Plank, we will calculate the energy of each of the photons. The relationship between total energy and unit energy will allow us to determine the number of photons
The mass of water in the soup is 477g
The change in temperate is
Use the following equation to calculate the heat required to raise the temperature:
Here,
m = Mass
c = Specific Heat
The wavelength of the ration used for heating is
The number of photons required is the rate between the total energy and the energy of each proton, then
This energy of the photon is given by the Planck's equation which say:
Here,
h = Plank's Constant
c = Velocity of light
Wavelength
Replacing,
Now replacing we have,
Therefore the number of photons required for heating is