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GROAN TUBES!!!
Introduction:
Gravity is an amazing discovery. Without gravity, our whole universe along with others would collapse and end life as we know it. Therefore, it is safe to say that without gravity, we would not be here. There are certain devices that can harness the power of gravity and use it for several purposes. One of those devices is called a Groan Tube.
Deriving Question:
Now, what is a Groan Tube and what does it do? Let us find out!
Materials:
1 Groan Tube
These are examples of Groan Tubes.
More Groan Tubes.
Procedure:
The Groan Tube is a simply device to use. Basically what a Gravity Tube is is a long tube with a cylinder-shaped object in it. That object has holes in it, which allows for air to pass through it.
Step 1: Hold the Gravity Tube with one hand so that the object is resting at the bottom of the tube.
Step 2: Quickly twist the tube upside-down and you will be able to hear the weird noise coming from the cylindrical object.
Scientific Principle:
Newton's First Law of Universal Gravitation
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When you flip the tube over in the air, you raise the noisemaker to the top of the tube. When the inner tube is at the top of the tube, it has gravitational potential energy. As the noisemaker responds to gravity pulling it down, the potential energy is converted to the kinetic (moving) energy causing air to move through the inner tube converting some of the kinetic energy to sound energy. The inner tube doesn’t speed up as it falls, as the lost potential energy turns into sound energy. When it hits the bottom, the remaining kinetic energy is turned into heat in the collision.
A closed tube end must be a wave node, while an open tube end must be an antinode. By analogy, the anchored end of a vibrating string must be a node, while the free end (if there is any) must be an antinode.
Note how there is more than one wavelength suitable for producing standing waves of vibrating air within a tube that precisely match the tube's end points. This is true for all standing-wave systems: standing waves will resonate with the system for any frequency (wavelength) correlating to the node/antinode points of the system. Another way of saying this is that there are multiple resonant frequencies for any system supporting standing waves. (1)
All higher frequencies are integer-multiples of the lowest (fundamental) frequency for the system. The sequential progression of harmonics from one resonant frequency to the next defines the overtone frequencies for the system
As you can see from the pictures on the right there is both ends are open and one end is open tubes presented. Groan tubes represents one end close and both end close demonstrations while you invert the tube on open end, by the time cylindrical object goes down with the help of gravity the wavelength reduces and frequency increases. This leads a higher pitch sound to be heard from the tube.
Lower the wavelength is higher the frequency
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