When a standing wave occurs on a string, 1.all points along the ...

[roselinechinyere27m]

When a standing wave occurs on a string,
  1.all points along the string move up and down equal distances.
  2.all points along the string move up and down, but some move more than others.
  3.many points along the string move up and down, some move more than others, and some are stationary.
  4.all points along the string are completely stationary because the waves from each direction cancel each other out.

Question 2

The concept of superposition implies that (choose the best answer)
  1.when two waves that both have positive displacements cross each others' paths, the resulting wave will also have a positive displacement.
  2.when two waves cross that are identical, except that one has a positive displacement and the other a negative displacement, they will cancel each other out at that point in space and time.
  3.two traveling waves can pass through each other without being altered.
  4.all of these are true.

[Sierray]

Answer to Question 1

3

Answer to Question 2

4

[roselinechinyere27m]

TYSM

[fatboyy09]

Excellent