Answer:Im doing that same quiz rn and i just put A
Explanation:
this is because EM energy is produced when electrically charged participles vibrate generating an electric filed and a magnetic field which sends out an EM wave.
i hope this helped
The galaxies are so far from the Earth, and their spectra so extremely
red-shifted, that I'm not able to see any of the items on the list.
Estimates of the Hubble constant still cover a wide range.
Let's assume that it's 70 km/sec per megaparsec, or
about 21.5 km/sec per million light years.
With that factoid, the speed of recession of each galaxy on your
invisible list is roughly
(21.5 km/sec) x (distance to the galaxy) / (1 million light years) .
You'll find ... if it's important enough to you for you to carry out the work ...
that the farthest galaxy is the fastest, the nearest one is the slowest,
and the others fall similarly in line.
In other words:
No matter where we look in the universe, and no matter
in what direction we look, we observe that:
-- all distant galaxies are moving away from us
and
-- the farther a galaxy already is from us, the faster
it's moving away from us.
This observation could have been enough to give us
a giant inferiority complex, or to cause us to go brush
our teeth and rub on some deodorant.
Answer:
Explained
Explanation:
This happens because the water cancels the focusing effect of our eye lens. A drop of water makes a lens because of the different refractive indices of water and air.
When we are underwater with naked eyes, the front part of our eye lens does not have different refractive indices anymore… both the inside lens and outside lens are essentially water ( lens inside our eyes are water only surrounded by a membrane)… hence, that part of the lens does not focus the light anymore. And thus, your eyes don’t work well anymore. (It can only partly correct for this, by bending the lens more)
When we put swimming goggles on, we remove the water and again have air in front of our eye lenses, and they work normally now. Obviously, we have created an extra interface between water and air in front of our swimming goggles. However, this surface(the goggle) is flat. And thus it does not function as a lens but only as a window.