1 Coulomb of charge = 6.25*1018 . How?
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It seems the same as asking "How is 1 mile 5,280 feet ?"
The amount of charge on every electron and every proton is the same. For human
people, it's a very small amount of charge, so we work with a larger unit, called the
Coulomb. That's the amount of charge on 6.25 x 10¹⁸ electrons.
In a wire, when that many electrons, carrying that amount of charge, pass by
some point every second, we call the current in the wire 1 Ampere.
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Displacement is distance combined with
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Answer: An atom valence electron shell determines its chemical reactivity.
Explanation:
An atom's valence electron shell determines its chemical reactivity. The amount of electrons in the outermost shell of an atom is its valence electron and it determines how reactive the atom is.
The reactivity of an atom depends on the number of electrons in its outermost shell. Atoms that has their outermost electrons full e.g noble gases like argon, krypton etc are unreactive because there is no room for the atom to donate or accept any electron.
Elements like sodium and chlorine are reactive because they possesses 1 and 7 electrons in their outermost shell respectively as such they can donate and accept electrons making them reactive elements.
The valence electron shell of an atom determines its chemical reactivity. This is due to the role these outermost electrons play in the formation of chemical bonds. Atoms aim to achieve a stable state, typically with eight electrons in their outermost shell, through accepting, donating, or sharing electrons.
The correct answer to the multiple choice question about the atom's valence electron shell is '2. determines its chemical reactivity'. The outermost shell of an atom is known as the valence shell. This shell, holding the valence electrons, is essential in determining an atom's chemical reactivity. This is because it's the valence electrons that are engaged in the formation of chemical bonds.
Chemical reactivity refers to the ease with which an atom gains, loses, or shares electrons. Stable atoms, like helium or larger atoms with eight electrons, are less likely to participate in chemical reactions. They already have a filled valence shell. However, other atoms, those with less than eight electrons, will strive to complete their outer shell by interacting with other atoms, either accepting, donating or sharing electrons to achieve stability.
Importantly, not all elements have enough electrons to completely fill their outermost shells and so they form chemical bonds by sharing, accepting, or donating electrons to other atoms. The formation of these bonds is largely determined by what is often referred to as the 'octet rule', which states that atoms seek to fill or have eight electrons in their outermost electron shell to achieve greater stability.
For more such questions on valence electron, click on:
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Frequency: Number of cycles in a second. Since 0.5s = 1 cycle, 1s=2 cycles
Period is 0.5s, frequency is 2
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For this case the main unit is liter.
The first thing you should know is that the liter is a unit of volume.
The difference then between hectoliter and kiloliter is the conversion factor.
For hectoliter we have:
1 hectoliter = 100 liters
For kiloliter we have:
1 kiloliter = 1000 liters
Answer:
The difference between both is the conversion factor:
1 hectoliter = 100 liters
1 kiloliter = 1000 liters
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to another, conduction and convection need some material stuff
along the way, otherwise they don't happen.
There is no material stuff between the Sun and the Earth, so
the Sun's energy reaches us by radiation.
The Sun's energy reaches the earth by Radiation
Further explanation
Heat is the energy transfer of an object with the environment or other objects because of the temperature difference between the two.
Heat moves from high-temperature objects to low-temperature objects
The process of heat transfer has 3 types
- 1. Conduction, which is the transfer of energy that requires an intermediate medium and without the transfer of particles
- 2. Convection is the transfer of energy due to the movement of the particles
- 3. Radiation is the transfer of energy without an intermediate medium / through vacuum
Energy from sun to earth through its atmosphere is not through conduction because the atmosphere is a bad conductor. Whereas convection is not possible because the earth must be heated first. And conduction and convection cannot pass through vacuum
Heat transfer from the sun occurs because its energy is carried in the form of electromagnetic waves
Learn more
the type of heat transfer takes place when the furnace is up to an entire room
Convection is a mode of heat transfer
the sun transmits heat to Earth only by radiation
the process of convection
Keywords : heat, radiation, convection, conduction, sun
wire has a resistance of 1.3 ohms. The crosssectional
area of this wire is
(1) 7.9 × 10^−8 m2 (3) 4.6 × 10^0 m2
(2) 1.1 × 10^−7 m2 (4) 1.3 × 10^7 m2
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The cross-sectional area of the copper wire is which has 1.3 ohm at 20 degree Celsius during laboratory experiment by student is 7.9×10⁻⁸ ohm.
What is the resistance?
Resistance is obstacle for the current flow in the circuit. It is the measure of reverse act to current flow in through a material. It can be given as,
Here, (ρ) is the specific resistance (l) is the length of the wire and (A) is the cross-sectional area of the wire.
During a laboratory experiment, the student finds that at 20° Celsius, a 6.0-meter length of copper wire has a resistance of 1.3 ohms.
The value of resistivity of copper wire is 1.72×10⁻⁸ ohm-m. Put these values in the above formula as,
Thus, the cross-sectional area of the copper wire is which has 1.3 ohm at 20 degree Celsius during laboratory experiment by student is 7.9×10⁻⁸ ohm.
Learn more about the resistance here;
ρ = resistivity of copper at 20 °C = 1.72 x 10⁻⁸ ohm-m
R = resistance of the copper wire = 1.3 ohm
L = length of the copper wire = 6 meter
A = area of cross-section of the copper wire = ?
Resistivity of copper wire is given as
R = ρL/A
inserting the values in the above equation
1.3 = (1.72 x 10⁻⁸) (6)/A
A = 7.9 x 10⁻⁸ m²
Hence the correct choice is
(1) 7.9 x 10⁻⁸ m²
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An antenna’s receiving circuit select electromagnetic radio waves of a certain frequency and reject all others. This is because an antenna IS an electromagnetic radiator that creates an electromagnetic field that scatters from the transmitting antenna to the receiver’s antenna.