Measuring Definition and 1000 Threads

if H=H_{x}+H_{y} and \Phi(x,y) = cos (\pi x/a) cos (\pi y/a) sin(2 \pi x/a) sin(2 \pi y/a) if we measure H_{x} what do we get? the energy for this an infinit potential well is E_{n} propotional to n^{2} so do we just say that H_{x} |\Phi>_{x,y} = E_{n} |\Phi>_{x,y} ? and the n...

i want to know which type of thermocouple is used in measuring superheated steam temperature coming out of boiler? this temp sensor is used in accordance with desuperheater to reduce the temperature of excessive superheated steam... can u provide with its range, accuracy, and resolution

Hello, I'm currently doing a College Physics Project for expotential decay / growth. I have an idea of the experiement I want to perform but I need to find a way of measuring the temperature of wire as I put a voltage through it. Is there a formula which may be useful or any techniques people...

Is there a way to measure centripetal acceleration independent of a force measurement? If I had just a ruler, and a ball was rolling along a circular path, could I 'measure' the centripetal acceleration itself, without resorting to finding the radius, period, etc. Someone once told me that this...

I have this question as a pre-lab for a physics electricity and magnetism lab. (I attached the question as an image.) I am having difficulty answering the second part: A full-wave rectified DC current is just the absolute value of the sinusoidal AC current...

Hello All, The final segment of my test circuit includes the ability to measure DC (constant or noisy and pulsed) voltage and current. I'm trying to come up with an elegant solution that will give me decently accurate measurements. What I have thought of so far is to use a high value resistor...

Homework Statement A wavelength measurement gives Lambda= 6000 x 10^-10m with an accuracy of one part in a million. What is the minimum uncertainty in the position of the photon? Homework Equations deltaP*deltaX > h/4pi p = h/lambda The Attempt at a Solution In order to solve...

When a voltmeter measures the AC voltage in a circuit, does it measures the root-mean-square value of the voltage? Is the same true for ammeters and AC current too?

We have measures that define the volt, amp, kilo, pressure, etc, etc, compared to these measures how accurate are red shift figures? i know that tolerances are only guaranteed in a machine shop if the temperature is within limits, and all the above can be tested time and time again, but how...

Suppose I connect 2 9v batteries (for example) in series with a fish tank (30mm x 30mm x 20mm) containing water and an ammeter, is the current registered the same as the current in the water? I should think so but I am not sure. The copper wires-cum-electrode being positioned at either ends...

Here's my thinking: The faster you go relative to the universe, the more the universe appears to contract. However, c remains constant as measured by distance/time. Now, what about to a photon? To a photon, the entire universe would appear as a single point, correct? To this same photon, c...

Homework Statement How do you calculate the probability of measuring a specific energy value of a particle (eg. what's the prob that you'll measure exactly E=h^2/8ml^2 in a given particle)? The Attempt at a Solution When I saw the word probability, I just thought: Probability=Integral(psi*...

What is the difference between accuracy of a measurement and its level of accuracy? Is the level of accuracy quantitative or a qualitative measure?

can anyone describe wat is dB level. can dB level be showed through receiver or field strength meter? thx for helping

Homework Statement Brief: Using the following: 1 ruler or stick, 1 tape measure, 1 ball of string, 1 timer, 1 calculator (+anything else you think you need) Create an experiment which you will measure the rotational velocity of the earth. Initially what you must do is measure the time it...

Can anyone explain me what kind of chassis dynos are used to measure shaft torque/power and how they do it. BTW... Things I allready known; I know that inertia brake dynos use a solid disc flywheel of a constant mass and radius and by meassuring time and flwheel speed (rpm), we can...

hello. i was wondering if anyone could give me any good practical ways to measure the magnitude of the magnetic field produced by a solenoid with (varying) current(s) passing through it (more generally, how can i measure a magnetic field). any sugestions would help, even if its things like...

A particle lives for a short time before breaking apart into other particles. Suppose it is moving at a speed of 0.996c, and an observer who is stationary in a laboratory measures the particle's lifetime to be 3.00 10-8 s. What is the lifetime according to a hypothetical person who is riding...

Hello, Can you help me understand physical meaning of measuring water level by measuring differential pressure. In open water tank it's fairly easy. One side of the transmitter is open and exposed to athmospheric pressure. In such case, differential pressure is directly proportional to water...

Archimedes' principle, electrical impedance, calipers, etc. - which is both practical and accurate in ascertaining one's percentage of body fat? Have scientists yet tried mechanical resonance as an indicator of flab?

Hi, I'm trying to measure some low capacitance using parallel plates i built. We're probably looking into the pF, say maybe 20pF (with the pcb board etc). The change in capacitance that i am really interested is very small. For the moment, i have use water as my dielectric. The capacitance...

Hi, I will be investigating the concentration of lead in Henna, a traditional moroccan substance we apply to our hands, for my extended essay. In order to do so, I have to derive method(s) by which I can easily measure concentration of lead. If you have any idea, please let me know. Your...

does anybody know how scientists and physicists at places such as CERN determine the speeds of the particles that they accelerate to nearly the speed of light? basically, what is their technique for determing the speed of the particles?

Heisenberg's imaginary microscope showed that it would be impossible to measure the position and velocity of a particle because observing it can change the position and momentum. However, assuming the laws of classical physics apply to these particles, I think an experiment can be set up to...

might be a naive question, but concerning the blast furnace: they blow pure o2 through the raw iron to oxidise impurities like carbon etc, but that would mean that exactly the right amount of o2 would have to be blown through before the iron also started reacting, which in turn means the...

As I understand it we can use the principle of parallax to measure distances to objects within 400 light years from Earth. So how are the further stars and galaxies calculated?

Hi, Kinda new here so here goes. I have been asked to drawn a graph B(magnetic field) vs Tan theata and find its slope, ok no problem there. The next question has asked me to use the value of the slope to obtain the value of the strength of the Earth's magnetic field in the region :eek...

Hi everybody, I have a question concerning a "stupid" thing i did today. I found a electric multimeter (if it is called so- you know, the device that measures dc current, the resistance in Ohms, dc and rms of ac voltage...), and thought to measure my body resistance. I didn't even think that...

Homework Statement it is a reasearch project i have to plan an experiment to find what effect different wavelengths of light, from a lamp which is used to grow plants, will have on the output of an LDR. Homework Equations The Attempt at a Solution so far my plan is (breifly) to...

There are many experiments that supposedly prove that two entangled particles instantly effect each other when one is touched. I know I don't have to explain this since you all seem to understand it so well, but basically the two particles fly apart and we measure one's spin and the other is...

Hi! I am an English AS-level Physics student. I am stuck with my planning exercise and I thought these forums would be a good place to find some other people who are having similar problems, and perhaps we can work something out together. Homework Statement "You are required to design a...

I am interested in measuring the effects of a magnetic field on an electron in a tunneling state. I know very little about solid state and I have very little experimental experience. In order to learn what is required to perform such an experiment, I thought I would pose my question here...

Hi! If there are two operators A and B, which commute, what are the consequences of that to the measurement of the corresponding dynamic quantities?

hi friends; ı have a problem with nuclear physics. My problem is ; " Alternative methods for measuring nuclear size . (neutrons, protons...)" if you help me i am very happy and thank you for helps

I am currently studying the Hubble Constant as part of my high school physics course. I'm aware that inaccuracies in determining this constant are largely due to difficulties in measuring distance between galaxies. I really just wanted some information, or to be directed to some web sites that...

Homework Statement If I measure distance on a 1:500 drawing with a device that measures distance at 1:100, what distance will I get? The Attempt at a Solution I'm thinking that if I multiply my answer by 5 I'll get the actual distance. Correct?

I tried and I got a ridiculous large number for the neutrino mass. I basically used E=\gamma m c and then, for 10 MeV neutrinos, time taken is t + 10 seconds to reach Earth, for 50 MeV neutrinos, time taken is t seconds. Speed = \frac{100 000}{(t+10)} for 10 MeV and Speed = \frac{100 000}{t}...

Homework Statement Hi, I have been asked to research two types of clock. The first to measure periods of nanoseconds and the second, milliseconds. Obviously I have talked about atomic clocks first but what clock can measure periods of milliseconds? Cheers Homework Equations The...

Homework Statement I want to know how to measure the frequency of a stroboscope by using an LDR and picoscope, but I'm not sure what circuit I should make up with the LDR in order for picoscope to show the frequency. Homework Equations The Attempt at a Solution I thought...

In a discussion of Heisenberg's Uncertainty Principle I read that we must shine light on a particle to measure its position and velocity. How does this work exactly? Does the particle cast a shadow on a wall detector? Or is its position inferred some other way?

If I wanted to prove that whilst spinning a ball attached by a string in a circle, that: F = 4 * pi^2 * r / T^2 Where F = force from tension r = radius T = period of one rotation Ie. Proving that: F is directly proportional to r F is directly proportional to m F is direction...

Homework Statement Determine the rms value of the voltage that is measured as a function of frequency at f = 3.22MHz. e(t) = 50sqrt(2)cos(wt). A 100MHz oscilliscope is being used to measure the voltage across nodes AA' as seen in the figure. The input impedence of the oscilliscope is a 1Mohm...

Homework Statement Which is a more accurate way of measuring g, the acceleration due to gravity? Using a bar pendulum or a simple pendulum? Homework Equations Bar Pendulum = metal rod with slotted holes at fixed distances, which serve as pivots. The Attempt at a Solution For...

Who was the first person to measure sound waves and how did he do it. Also how can you measure sound waves with a tuning fork.

Hello I have a current through a simple circuit. What is the measuring unit of Log(I) where I is the intensity of the current measured in Ampers. Thanks

Ok the current situation I have is a magnetometer that measures heading, \psi, and a rate gyro measuring r (the euler equivalent of \dot{\psi}). To start with, I'm confused that one measures according to the aircrafts body framework and the other doesn't seem to...but anyway, the main question...

What is the most practical method of measuring where a home is losing heat? The idea is that these measurements would be the first step in calculating the most cost-effective improvement, deciding whether to increase insulation in ceiling, walls or floor, to upgrade to double glazed windows...

In the textbook it stated "In aqeous solutions, the concentration of hydronium ions is always related to the concentration of hyroxide ions. Therefore we can still measure or calculate the pH of solutions of bases like NaOH, even though they are not acidic." The book also stated that pH is a...

Is there any relation to find it's strength? I have got some raw data - 1# it depends on distance of light source of the object 2# how big the luminous object really appears from that place 3# intensity of the luminous object 4# how opaque is the object whose shadow is being formed...

Yeah yeah, complex/imaginary numbers are as *real* as real numbers. Just like irrational numbers are every bit *rational* as rational numbers. OK, so complex numbers are useful--very useful--but I think that a lot of people, including myself, still don't take them as a part of physical...