Electrons are negatively charged so an excess will produce a negative charge.
Light can be seen as an electromagnetic wave.
What happens when two waves, with the same frequency, superpose is called interference.
If at a certain point two waves arrive both with a crest, we have constructive interference and the amplitudes sum up, reaching the maximum value, resulting in bright spots.
If at a certain point one of the waves arrives with a crest and the other wave arrives with a trough, we have destructive interference, and the two amplitudes cancel out, resulting in dark spots.
Therefore, t<span>he dark bands on the wall are from destructive interference.</span>
Answer: 
Explanation:
We have this concentration in units of 
:
And we need to express it in 
, knowing:
Hence:
Answer:
B.will increase the maximum static friction between the box and the floor
Explanation:
Because static friction is the force that keeps an object at rest
Answer:
C. remix
Explanation:
A is wrong because the prefix ir- means not
B is wrong because the prefix un means not
C is correct because re means again
D is wrong because over means too much
