Friday
May 6, 2016

# Homework Help: Physical Science

Posted by mysterychicken on Friday, May 8, 2009 at 10:17pm.

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 - DrBob222, Friday, May 8, 2009 at 11:25pm

These look ok to me.

• Physical Science - Anonymous, Thursday, April 4, 2013 at 2:28pm

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/