The basic building blocks are called atoms
An atom is the smallest unit of matter that forms a chemical element. An atom is made up of three kinds of subatomic particles: electrons, protons, and neutrons.A molecule is a combination of atoms bonded together through a covalent bond. Generally, we think of molecules as having no charge (although molecular ions do exist)
Protons do not move out of the nucleus of atoms although they repel each other.
Remember that protons are particles with positive charge and they held together in the nucleus of the atom which is a tiny tiny region. As you know, like charges repel each other, which means that the protons exert a repulsion force.
The answer is B, if your body doesn’t consume enough vitamin D, it takes calcium from your bones. This is called losing bone mass. Losing bone mass makes the inside of your bones weaker and have a higher risk of fractures (especially children).
Answer:
correct answer is 30 cm as light-gathering power will be better
Explanation:
given data
one aperture have = 20 cm
other aperture have = 30 cm
solution
while we shopping online for buying telescope, we will choose here aperture of 30 cm because as the larger is the lens it will be make here clearer the image so here in both aperture of 20 cm or 30 cm , 30 cm have higher length
so correct answer is 30 cm as light-gathering power will be better
