Answer:
B
Explanation: a chemical reaction is only the rearrangement of electrons where a nuclear reaction actually changes the elements and thus the nuclei
As much as 90% of the matter in the universe my be unseen i.e. dark matter. There is a variety of explanations offered by many astronomers and physicists for this dark matter. It could merely be ordinary material such as ultra-faint stars, cold gas, large or small black holes or dust scattered around the universe, all of which emit or reflect too little radiation for our instruments to detect. It could also consist of exotic, unfamiliar particles that we have not figured out how to observe.
<span>Because of
the density of the paperclip it sinks, but even though a boat is normally made
of steal it contains an opposite force of gravity known as buoyancy. Buoyancy
is the reason that a boat will float. Boat density is less weight than the water
they are in so this is one reason that they are floaters.</span>
The answer is "<span>The rocks in which the fossils were found were formed under an ocean.". The mountains were once underwater and were pushed up over time by the collision of tectonic plates.</span>
Answer:
563.64 m
Explanation:
Given that as per the question
x = 5 cm = 0.05 m
D = 4.2 × 107 m
d = smallest aperture size
As per the situation the solution of the smallest aperture telescope that she can get away with is below :-
We will use Rayleigh's diffraction limit which is
The equation will be
![d\frac{0.05}{4.2\times 10^7} = 1.22[550\times 10^{-9}]](https://tex.z-dn.net/?f=d%5Cfrac%7B0.05%7D%7B4.2%5Ctimes%2010%5E7%7D%20%3D%201.22%5B550%5Ctimes%2010%5E%7B-9%7D%5D)
d = 563.64 m
So, the answer is d = 563.64 m
