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Science Exit Project

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Elijah Cardoza

on 24 May 2013

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Transcript of Science Exit Project

If will get there? How do the mutes and regular trumpet affect wind speed and sound? (8th grade science Exit Project) Question: How do the mutes and regular trumpet affect wind speed and sound?

Hypothesis: The regular trumpet’s wind speed will be high and sound will be low compared to the mutes which will bring higher sound and low wind speed for mutes block majority of air exhaust from the trumpets bell for thats were the mutes are inserted. Furthermore, the mutes are suppose to enhance sound but if the sound is being enhanced for the trumpet just how much wind do I the trumpeter need to put in? For if I put in more air than necessary the note might come out higher than what is needed. TERMS TO COMPREHEND BEFORE HAND Trumpet-
An aerophone and the highest brass instrument.
A trumpet is basically a brass pipe spiraled ending in a cylindrical form
Can be played in a high partial or low partial by changing the airspeed and lip tension creating a high or low note. Under the keys lie “valves change the length of the tubing, lowering the pitch of the instrument. Three valves make the trumpet fully chromatic, allowing the player to play in all keys.”- http://www.syncrat.com/2j6 Mute (meaning mutator,mutation.) - a sound quality changer for brass instrument.
The primary types of mutes are a straight mute, cup mute, and plunger mute.
There are secondary mutes such as wah wah mutes and hat mutes. Testing Info Variables:
Independent Variable: Regular BTrumpet and Mutes
Responding Variables: Wind Speed and Sound
Controlled Variables: Notes Materials:
The regular B(flat) trumpet
Cup mute
Straight mute
Cleartone mute
Homemade anemometer
Decibel meter application (Decibel 10th by Skypa) Procedures

Run through trough trumpet c major scale notes on the regular Btrumpet
and record mph of wind speed and sound decibel amounts for each note on a data table.

Run through trough trumpet c major scale notes on the Btrumpet with the cup mute
and record mph of wind speed and sound decibel amounts for each note on a data table.

Run through trough trumpet c major scale notes on the Btrumpet with the straight mute
and record mph of wind speed and sound decibel amounts for each note on a data table.

Run through trough trumpet c major scale notes on the Btrumpet with the cleartone mute
and record mph of wind speed and sound decibel amounts for each note on a data table.

Then convert the data into 2 graph for a different note and decibel and then notes and airspeed. One axis for the mph of wind speed and one for the decibels of sound. Also a table. The experiment will feature primary mutes. Test will be conducted for decibel amounts and wind speed between the mutes and the regular trumpet only using eight different notes from low C to high C with no sharps or flats notes only natural notes. Testing Info (continue) Analysis


To recapitulate, the question: How do the mutes and regular trumpet affect wind speed and sound?

The prediction was that the regular trumpet’s wind speed will be fast and sound will be faint compared to the mutes. The mutes would bring the exact opposite, mutes block the trumpet’s bell blocking air giving little air speed at all but mutes heighten sound giving high decibel reading.

Subsequently, the hypothesis was wrong. According to all 3 trials of data the was no reading for the wind speed for the trumpet alone or the trumpet with the mutes never made the anemometer fully revole and whatever air that was muster from the instrument on to the anemometer made it twitched. I assume when they call the trumpet a wind instrument that mean air is only an input through the mouthpiece not an output through the bell. The output is sound. According to cnx.org, “In most wind instruments, a vibration that the player makes at the mouthpiece is picked up and amplified” meaning the output is majority vibration not air through the bell and the vibration must be sound.

Speaking of sound there was no change in sound measurements at all it was a steady 45 decibel increase.Which proved my hypothesis wrong. Also according cnx.org the trumpet sounds are standing waves - sound waves that never change their position making the ability of mutes to change pitch upon trumpet useless for they will never be ever be alter the sound wave decibel mesurement.

So thus this is the answer to the research question: how do the mutes and regular trumpet affect wind speed and sound?
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