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fruitl00p
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Homework Statement
A man strikes a long aluminum rod at one end. Another man, at the other end with his ear close to the rod, hears the sound of the blow twice (once through the air and once through the rod), with a 332ms interval between them. How long is rod?
Homework Equations
unsure about relevant equations. But because I think this might be
open end air column or a closed end
speed= frequency*wavelength
(for open end) wavelength= (2/n)*Length
(for closed end) wavelength= (4/n)*Length
The Attempt at a Solution
At first I attempted this by doing v=x/t
I assumed velocity of sound to be 340m/s, and the time .332s, so
340m/s *.332s= x = 112.8 but I got that wrong.
Then I thought maybe I should treat this as an air column, but I can't figure out if this is a open end or closed end air column. I'm reading a section on these concepts but I'm just confusing myself even more. The aluminum rod is struck and the man on other end hears the sound once in the air
but just once through the rod. What does this mean??