Answer: True
Explanation:
The speed of light in a material medium depends on its molecular structure, in particular its electromagnetic properties, electrical and magnetic permeability. These properties may have different values for different wavelengths or frequencies of the incident light.
In this way,<u> the speed of light depends on the medium and reaches its maximum value in a vacuum</u>, so that, it will be lower in a material medium . In the vacuum (or in the air) the speed of light is 3 x 10⁸ m / s and in any other medium its value is lower.
<u>To characterize the particularities of the propagation of light in the media</u>, the refractive index is introduced
,
n = c / v
where c is <u>speed of light in a vacuum</u> and v is t<u>he speed of light in the medium</u> considered
. So the speed of light in a medium is given by the refractive index whose value is always greater than 1.
Dalton's theory explained that all matter constitutes of atoms that are indivisible and indestructible. They combine in definite ratios and posses definite masses. He considered atom to be the smallest particles that the matter is composed of. He basically explained about the chemical properties of matter.
After many more researches, it was explained that atom is not the smallest particle that the matter is composed of but it contains many subatomic particles like protons, neutrons and electrons that the matter is made of. Dalton could not explain about the nuclear property of atom.
Answer:
Tin (Sn) as in the periodic table the element tin has 50 protons
Explanation:
In a chemical reaction, the atoms and molecules produced by the reaction are called products.
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.
In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Answer:
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products.