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kipiarov [429]
3 years ago
5

Select the correct answer. Which sentence about particles in matter is true? A. Atoms are present in solids and liquids but not

in gases. B. The particles of matter are in constant motion. C. The same kinds of atoms are found in different elements. D. When a solid changes to a liquid, the sizes of the particles change.
Physics
1 answer:
Pie3 years ago
4 0

Answer:

B : The particles of matter are in constant motion

Explanation:

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Nuclear _________ reactions convert protons into helium; thus, becoming the source of all energy radiated by the sun. A) fission
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Nuclear fusion reactions convert protons into helium; thus, becoming the source of all energy radiated by the sun.

Answer: Option D

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So large amount of energy is required to start the nuclear fusion reaction. The fusion reactions mostly occurs in stars. The illumination in Stars even the Sun is due to nuclear fusion reaction occurring with the atoms present in them.

Mostly the energy radiated by Sun is due to the protons-protons chain reaction. In this chain reaction, the protons get converted into helium due to nuclear fusion reaction, thus becoming the source of all energy radiated by the Sun.

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Roman55 [17]

Answer:

The separation between the charges was decreased by a factor of 0.2

Explanation:

The Coulomb's force between two charges is given by;

F = \frac{kq^2}{r^2} \\\\let \ kq^2 \ be \ constant\\\\F_1r_1^2 = F_2r_2^2\\\\r_2^2 = \frac{F_1r_1^2}{F_2} \\\\increasing \ the \ force \ between \ them \ by \ factor \ of \ 25\\\\(F_2 = 25F_1)\\\\r_2^2 = \frac{F_1r_1^2}{25F_1}\\\\r_2^2 = \frac{r_1^2}{25}\\\\r_2 = \sqrt{\frac{r_1^2}{25} }\\\\ r_2 = \frac{r_1}{5}

r₂ = 0.2r₁

Therefore, the separation between the charges was decreased by a factor of 0.2.

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An atom that no longer has a neutral charge is called an ion

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