All of the answers apply because any object can have positive, negative or neutral charges depending on their atoms
The number of protons for an atom with 20 neutrons and 20 electrons will be 20.
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What is an atom ?</h3>
An atom is the smallest particle of an element. It consist of proton, neutron and electron.
To determine the number of protons and also identify the correct symbol for an atom with 20 neutrons and 20 electrons, we must first acknowledge the following facts
- Atom in a neutral state, the number of protons must be equal to number of electrons.
- Atom in a nuclear stable state, number of protons must be equal to the number of neutrons
Therefore, the number of protons for an atom with 20 neutrons and 20 electrons will be 20.
The symbol for this atom is Ca which is Calcium.
Learn more about Atom here: brainly.com/question/6258301
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Answer:
I₂ = 25 W / m²
Explanation:
Intensity is defined as the relationship between power and area
I = P / A
the power emitted by the sun is constant
P = I A
for the two points of interest
I₁ A₁ = I₂ A₂
energy is distributed on the surface of a sphere
A = 4π R²
I₁ R₁² = I₂ R₂²
I₂ =
let's calculate
I₂ =
I₂ = 25 W / m²
In this case the coordinate z is multiplied by your wave vector k, so it travels along z. Note that the electric field will be oscillating along the x direction. H and E are perpendicular to the direction of travel in vacuum.