A resonator.
Hollow tubes is an redundant expression. Tubes must be hollow, by definition. However tubes can be filled with something so they are not "empty" (they still will be hollow).
Hollow does not mean empty. Hollow means there is a container. Sound will travel in whatever carries it. (all materials consisting of more than two strongbonded captive atoms are not a vacuum, and will carry sound.) The container, filled with hollowness (you might get near vacuum. grin.), will carry sound from one end to the other because the container has more than two bonded atoms.. Does a hollow have sides? Yes. An inside and an outside. I actually wonder, is there a vacuum inside a single atom? Jaak.
Hollow point bullets literally have a hollow point, and ball ammo does not.
No, dispersion doesn't occur through a hollow prism.
*concave . curved like a segment of the interior of a circle or hollow sphere; hollow and curved
resonator
A resonator.
They are acoustic, inside is a diaphram that vibrates and amplifies sound passing it through the hollow tubes.
nothing actually vibrates, the length of it determines the pitch, all the didgeridoo is is a hollow tube that amplifies certain wavelengths of sound produced when you "blow a raspberry" the lower pitches are most often amplified, hence you do not hear the higher sounds, giving the didgeridoo it's tone.
Like other acoustic instruments, the hollow body resonates with the string vibrations and amplifies the sound
a core
the morula develops into a hollow, fluid-filled ball of cells called a blastocyst.
Most are not. Some may have hollow parts, but most are filled with lead.
Renal Pelvis
Hollow Porcelain Fish Chamber - 2009 was released on: USA: 27 September 2009 (Sidewalk Moving Picture Festival)
Gold plate is a layer of gold thinner than paper. Gold filled is made of gold, but hollow, and the hollow is filled with another metal. Gold filled has much more gold.
Hollow tubes is an redundant expression. Tubes must be hollow, by definition. However tubes can be filled with something so they are not "empty" (they still will be hollow).