# Physical Science

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I need help with a few of these questions:

1.Which of the following waves are mechanical waves?
A.light waves
B.microwaves
D.sound waves
I think it's D?

2.Which gives the frequency of the wave in terms of its peaks?
A.the height of the tallest peaks
B.the number of peaks per meter
C.the number of peaks passing a point per second
D.the height of the peaks divided by the width of the crest
I think it's C

3.Which travels at the greatest speed?
A.sound through air
B.light through glass
C.sound through water
D.light through a vacuum
I think this one might be D...?

Thanks!
-MC

• Physical Science -

These look ok to me.

• Physical Science -

ok umm this isn't an answer but I just wanted to say this site has helped me SOOOOO much. 100,000,000 Thx to the runner of the site. you've made my school life much easier/

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