Electromagnetic waves can travel through a vacuum. Because they do not give up energy
in traveling, Electromagnetic waves can cross the great distances that separate stars
and galaxies. Rays from the Sun travel nearly 150 million
kilometers to reach Earth's surface.
Answer:
Δ P = 13.24 Pa
Explanation:
Given that
Density of oil ,ρ₁ = 9 x 10² kg/m³
We know that density for mercury ,ρ₂ = 13.6 x 10³ kg/m³
The change in the height of column ,Δh = 1.5 mm
The pressure given as
P = ρ g h
Change in the pressure
Δ P = ρ₁ g Δh
Now by putting the values
Δ P = 9 x 10² x 9.81 x 1.5 x 10⁻³ Pa
Δ P = 13.24 Pa
Therefor the change in the pressure will be 13.24 Pa.
Answer: 0.1524 km
Explanation:
We have to convert 
to kilometers, and we can do it knowing 
and 
:
Hence:
<span>d. will fruit flies bred under different conditions mate?
Let's look at the possible choices and see which of them make any sense given the experiment.
a. do well-fed fruit flies make good pets?
Seems kinda silly, but if this were the question being asked, I suspect the experiment would have some fruit flies that were well fed as well as some fruit flies that were starved and would then compare how those 2 populations of fruit flies interacted with people. But that wasn't done, so it's unlikely this is the question being asked.
b. what kind of food do fruit flies prefer?
Each population of fruit flies weren't given a choice as to available foods. So their preferences didn't come into play about what they were allowed to eat. So this question is also unlikely.
c. how many species of fruit flies can mate with each other?
The scientist started with a single population and divided it into two sub groups. There doesn't seem to be a large number of species of different fruit flies here, so this is also an unlikely question.
d. will fruit flies bred under different conditions mate?
The scientist started with a single population of fruit flies and divided them into two groups. Each group was allowed to breed for many generations with a different food for each group (e.g. Allowed to breed under different conditions). After they were both well established, the groups were merged together and observed which ones mated. It looks like this question is being answered. So this is the correct solution.</span>
