Instrument Definition and 91 Threads

Hi. Now I am working on my term paper on "Influence of constructive elements of electric guitar on its sound" and faced with the task to build a mathematical model of instrument sustain. So far I have not found any good source that would help me with this. Now I have this formula: But I don't...

Our brains are apparently musically happy when different individual notes are harmonically related to each other. In our music system, the fundamental frequencies of the different notes on a musical instrument such as the piano or the guitar are related to each other in such a way as to allow...

I've built an insulated chamber to protect a sensitive instrument at freeze temperatures in the winter. The instrument is mounted on a telescope, so the heat inside the chamber will slowly dissipate in the ambient. A digital PID thermostat is used to keep the temperature at a safeguard level...

Are there any non-hydrocarbon based lubricants that can be used on instruments like micrometer threads? I know silicone grease exists, but it doesn't have the film strength to protect the metal. Are hydrocarbons the only game in town?

Similar to Flight and Power plant training simulation softwares, is it possible to design and develop musical instruments training software simulators? Examples : Guitar,Piano,Violin,Trumpet, Drums,Saxophone etc. If Not, What are the challenges for designing and developing Musical instruments...

If I need to make a measurement to check compliance e.g. measuring component dimensions. How do I know what accuracy is required for the measuring instrument if the tolerance is not specified? For example, during an engine rebuild, the manufacturer specifies the valve stem diameter to be...

Hello, All measurement instruments have a finite accuracy. For example, a thermometer may provide a temperature measurement that is +-2F from the "actual" and true temp value. For example, if the reported measurement is 70F, the actual temperature may be between 72F and 68F. That said, let's...

Is there maybe instrument using two concave lenses? Tried to google it but found nothing. Thanks

Is this correct? "The systematic error in a measuring instrument due to non-uniform or wrongly marked graduation due to which a measurement may be less or greater than actual measurement is called zero error of the measuring instrument". Another one: The measuring instruments are combination...

Hello, thank you for your attention in my thread. I'm the head of Youth Science Club on one of the many High School in Indonesia, I got many members and I want to guide them for doing water sampling and analysis. In the history of my high school, no one is able to do water sampling and...

Summary: This is a hobbyist project I am working on. I am building an instrument to measure radiance from the sun at 500 nm, using optically filtered photodetector with bandwidth ± 10 nm. This type of science can be called Sun Photometry, so let's get to it! Geometry for Optics: The sun has an...

Hello, I have a general understanding of how we are aware of the presence of dark matter in the universe and the fact that we still don't know exactly what is that dark matter is made of. I would like to know which instruments are used to try and find an answer. For instance, from what I...

Im thinking that this is a telescope, but I am having a lot of trouble answering this question. If the plane waves arrive at different angles, wouldn't the image be distorted?Would the lenses possibly be spherical because of this?

Not much known yet, NASA is assembling a team to look into it. The Wide Field Camera 3 is the camera used for most off the "pretty pictures". https://www.nasa.gov/feature/goddard/2019/wide-field-camera-3-anomaly-on-hubble-space-telescope

Today I finally received the charango I ordered back in October. The eBay seller is in Bolivia, so it takes about 3 weeks to get from South America to where I live, not to mention that it has to go through customs. A charango is a small stringed instrument in the guitar family, about the size of...

Twelve years ago a stray artifact was unearthed near Rome. It is now claimed to be a musical instrument, possible similar to either a lute or a lyre. Here is a NY Times article on it (with recordings from some reconstructions) as well as some other ancient instruments.

Homework Statement For my lab report I am asked to calculate the error of a couple of measurements which I did with a lux meter. I know that the lux meter has tolerance(or accuracy?) 5%. The instrument is digital and it's last digit is 0.1. The maximum reading is 47.5 lux. Homework Equations ...

I need an instrument to measure the frequency of the sound of a vibrating violin string for a high school research essay. I tried using a Labquest and a vernier microphone to measure but it was way too imprecise. I need the instrument to very accurate in measuring Hz as the nature of my essay...

Homework Statement Homework Equations For question 14 PMMC measures average value MI measures RMS value The Attempt at a Solution I think PMMC should give 0 V But book answer is B i.e 1 V (where am I wrong?) and MI should give 1.414 V. For this book answer matches my answer.

Hi! I am trying to solve a textbook problem without any success. Fortunately, I found someone that solved it but there is one step that I don't get. Here is a figure showing the problem : https://ibb.co/koatCa First, we have (I get this part since I found a similar use of it in the book)...

So, I have a Bachelor's degree in Electronics and Communications (outside of US) and I wanted to pursue work in nuclear fusion so I had applied for an MS in nuclear engineering in the US. I have gotten admission in the University of Florida. Anyway, I was sharing this information elsewhere on...

Hi. Let's say I have data which I have measured. For example I measured a length of an object and the measurment was repeated 5 times. An instrument which I used to measure has an error, value of which I know. My options are to either to just go with the instrument error (probably not, right?)...

TheAdmin submitted a new PF Insights post Interview with Instrument Engineer Jim Hardy Continue reading the Original PF Insights Post.

I realize that in a spectrometer the spectral line being viewed will be the result of the actual spectral line plus an instrument line function as well (as seen in the linked image). What I don't understand is how this is produced? Someone tried explaining this to me once before but their...

Which instrument is used to measure altitudes in aircraft's

I recently did a level survey however am a little stumped over a calculation. I am trying to calculate the Reduced Level using the "Height of Instrument" method. I know how to do the calculations etc. so I am not asking for this to be done for me. It is more of a general question about this sort...

I didn't know where to put this, I figured I'd start here since this area sees traffic that other areas might not see. Someone can move it if there's a better section for it. I'm thinking of an instrument design that has a light path as follows: UV-Vis light source, monochromator or filter that...

What is the name of this Laboratory Instrument?

I had a question about how to properly perform error analysis on a series of distance measurements. I need to find the relative error in the distance. I was wondering, should I use the instrument uncertainty divided by the measurement (in this case, it would be 0.005m / (mean measurement)). Or...

Hello everyone, For the past 4 years I have been working on a new type of musical instrument that fuses together elements from electronic music into the acoustic realm. The instrument consists of 26 strings inside a wooden enclosure that are actuated (or "bowed") by the use of electromagnets...

My gas chromatography instrument ran out of air while cooling down and now it won't turn on, nor the computer it is hooked up to? Can this be fixed?

Homework Statement An instrument is producing a tone, such as a D4. If I know the frequency of the tone, the length of the instrument but nothing else, how can I find the harmonic at which the tone is produced? The instrument is an open tube. Homework Equations v=wavelength*frequency[/B]...

I found this forum while searching for information on William Close Earth Harp. There is a closed thread here on the subject though it seems some are still in doubt one could tease sound from a long string device. While William created his Earth Harp in 1999, Ellen Fullman created her long...

So I just discovered this awesome musical instrument today and thought I'd share it the forum. What do you think? I really like the sounds of this instrument, makes me think about ancient civilisations, not sure why... Almost like Aztec's or something.

Homework Statement A spaceship is sent to investigate a planet of mass M and radius R. While hanging motionless in space at distance 5R from the center of the planet, the ship fires an instrument package with speed v0 (at angle ##\theta## with the line passing through the spaceship and the...

I was shuffling through the previous years question papers & I got this question ! '' A sensitive instrument is influenced by the strong electric field. Write a possible way to prevent this effect. Why is the electric field normal to the surface? '' I am not sure what the answer it. But this...

Homework Statement Suppose the rocket is coming in for a vertical landing at the surface of the earth. The captain adjusts the engine thrust so that rocket slows down at the rate of 2.40m/s2 . A 6.00-kg instrument is hanging by a vertical wire inside a space ship. I don't know if there are any...

I hope to learn to play the piano someday. I love how it can fit into almost any genre of music, and I'm always moved by its fullness of sound and the variety of moods it can create all by itself. Lacking any constraints (money, time, etc.), what musical instrument would you learn to play and why?

Hi, I am a little confused with the phase change that occurs in closed end wind instruments. According to http://newt.phys.unsw.edu.au/jw/flutes.v.clarinets.html, the phase does not change when the sound wave reflects off the closed end of the instrument. I thought that the phase changes by 180...

From this article: Can anyone tell me why handwashing an instrument before putting it in the cleaning machine is a no-no?

Just out of curiosity why is the calibration interval 1yr for lab instruments like DMM, scope etc. Why not 2 years. Also, you use a higher accuracy bench DMM to calibrate a hand held DMM. Instead of getting calibration done by an outside agency, Why not calibrate the handheld DMM...

So I've had this question bugging me ever since I saw sound at physics class: How is it possible to match the resonance frequency of a column of air in an organ pipe and form a standing sound wave by simply blowing air into the column? The main reason I see this problematic is because I...

Hi, physicsforums! I have a dilemma: there seems to be several strange instruments in our class that nobody is able to identify. The description is as follows: One strip is a brown metal (copper?) and the other is a grey metal (invar? iron?). (I'm making guesses at the metals due to the...

Homework Statement A spectroscopic instrument can resolve two nearby wavelengths λ and λ+Δλ if λ/Δλ is smaller than 8000. This is used to study the spectral lines of the Balmer series of hydrogen. Approximately how many lines will be resolved by the instrument. The Attempt at a Solution...

I have data outlining the number of people who play a musical instrument and data outlining the total number of people in each city play an instrument....population 255......1 009 924 179......3 500 048 556...... 957 293 etc. how do I write the proportion of people who play an...

So I have to make an instrument and write a report but I'm stuck on the report. It says to -Uses all the wave unit vocabulary correctly(things like frequency,amplitude,wavelength,type of waves etc.), at grade level, and specific to your instrument. eg. standing wave, damping and -Includes...

I have a dosing pump spec. sheet from Milton Roy (a fairly reputable manufacturer) which says: Steady State Accuracy: +/- 1% Repeatably: +/- 3% Is this possible? Can an instrument be more accurate than it is repeatable? Intuitively, this didn't make sense to me. The spec. sheet...

I have an instrument whose spec. sheet mentions Accuracy as 2% of FSD. The scale runs from 0 to 1000 Litres per hour. Does this mean if I check the instrument versus a gold standard calibrating instrument at a flow of 500 Litres per hour (which is our typical flow) the absolute error can be...

I am busy studying engineering and I have a subject that requires us to design and build a working instrument using strain gauges. We have a workshop at our disposal and all necessary materials and electronics. At this moment my group and I are stuck with coming up with an idea for an...

Here's my problem: I have been using a digimatic indicator tool to measure the thickness of a somewhat uneven film. The digimatic indicator has a digital screen that shows up to 1 um, but according to specifications the accuracy is only 3 um. To account for the uneveness I have taken 10...