# Homework Help: Distinguishing between different waves.

1. Oct 1, 2007

### nblu

http://img162.imageshack.us/img162/6770/spa0187fa2.th.jpg [Broken]

The question was (need to refer to the attached image file),
a) Examine the graphs. Is the wave transverse, torsional, or longitudinal?
b) What are two indications that the wave could be a sound wave?

I can distinguish between the transverse, torsional and longitudinal waves,
when they are expressed in animation, however when they are expressed in sin graph,
I get stuck in the problem. For the fact that all 3 types of waves can be expressed into sin graph
what are some things that I should know when looking at the graph before comparing them?

Any tip would be appreciated.

Thank You!

Last edited by a moderator: May 3, 2017
2. Oct 1, 2007

### Staff: Mentor

I think the main clue would have to be what is being plotted on the vertical axis. What is it? And based on what you know about the three different types of waves, which would you say these are?

3. Oct 1, 2007

### nblu

a longitudinal wave because the vertical axis of the sine graph is measured in Pa?

4. Oct 1, 2007

### Staff: Mentor

That would be my answer as well. And it should help you with the "sound" part of the question.

5. Oct 1, 2007

### nblu

Thank you very much
and for the sound part, what would you say for my answer?

i. Sound wave is one of the most common types of longitudinal wave.
ii. Sound waves traveling through air are longitudinal wave.
iii. Particles being transported vibrate parallel to the direction which the sound wave moves.

I have 3 answers figured out in my head, but I'm not sure which one to exclude lol