the 440Hz and the 441 Hz tone bars are to be placed horizontally on stable surface. strike both tone bars with the hammer.

Question

10. what do you hear? report any pattern you hear to the sound generated.
11. when striking a single tone bar sprinkles some powder or sand into the bar and watch the powder. what observation can you make?
what is the name of this location?

Answer 1

google
beat frequency
eg
http://hyperphysics.phy-astr.gsu.edu/hbase/Sound/beat.html

google
nodes
normal modes
eg
http://en.wikipedia.org/wiki/Normal_mode

Answer 2

so it creates a beat. powder goes to 2 points on the bar and the points are called nodes.

Answer 3

yes, you have the idea. The points on the bar that do not move are the nodes. The sand flies off the rest of the bar.