I = Current q = total charge t =time taken to pass electron from a certain point. Number of Electrons =2.5×1019. Total charge q=ne=2.5×1019×1.6×10−19=2.5×1.6= 4C.
The net force is negative, and there is a change in motion.
Rarefactions are where you see the wave further apart. Where it's closer together, it's called a compression.
Answer:
b
Explanation:
because a elastic band uses elastic energy
The equivalent resistance of n resistors connected in parallel is given by

(1)
In our problem, the resulting resistance of the 5 pieces connected in parallel is

, and since the 5 pieces are identical, their resistance R is identical, so we can rewrite (1) as

From which we find

.
So, each piece of wire has a resistance of

. Before the wire was cut, the five pieces were connected as they were in series. The equivalent resistance of a series of n resistors is given by

So if we apply it at our case, we have

therefore, the resistance of the original wire was

.