What is Energy loss: Definition and 159 Discussions
Spin-polarized electron energy loss spectroscopy or SPEELS is a technique that is mainly used to measure the dispersion relation of the collective excitations, over the whole Brillouin zone.
Spin waves are collective perturbations in a magnetic solid. Their properties depend on their wavelength (or wave vector). For long wavelength (short wave vector) spin wave the resulting spin precession has a very low frequency and the spin waves can be treated classically. Ferromagnetic resonance (FMR) and Brillouin light scattering (BLS) experiments provide information about the long wavelength spin waves in ultrathin magnetic films and nanostructures. If the wavelength is comparable to the lattice constant, the spin waves are governed by the microscopic exchange coupling and a quantum mechanical description is needed. Therefore, experimental information on these short wavelength (large wave vector) spin waves in ultrathin films is highly desired and may lead to fundamentally new insights into the spin dynamics in reduced dimensions in the future.
SPEELS is the one of the few techniques that can be used to measure the dispersion of such short wavelength spin waves in ultrathin films and nanostructures.
Hello everyone,
I am trying to calculate the energy loss and straggling of alpha particles with same energy, I used LISE++ to obtain the energy loss in every layer of the materials using Spectrometer Design of LISE++, but I can only calculate the energy-loss straggling layer by layer. Does...
As the piston of an internal combustion engine moves up and down inside the cylinder, it goes from zero-max-zero speed. In a race engine, the maximum speed may reach up to 100 mph. So the question is how much energy is expended every time the piston decelerates to zero speed when it hits bottom...
(112 x 8.36 + 122 x 8.51) - 235 x 7.59 = 190.89 MeV
My question is what should I do about the incoming neutron on the left that starts the fission. My thinking is that it does not have any binding energy and therefore I left it out of the calculation. Is that correct? Thank you
Hello everyone. I have just complete an experiment calculating the speed of a muon. I got it to 2.6E8 m/s, however I know that they are created at close to speed of light to be able to get down to Earth's surface in their short lifespan. This speed could not have been its initial speed, as it...
Generally, one would expect the beam to lose its content (energy or particles) if it hits anything before its reaching its target. The whole idea of maintaining (conventional) vacuum using pumps or other means is to minimize that loss. But is it possible that there could be a beam loss purely...
Explanation 1:
Eddy currents induced, energy loss due to joule heating.
Explanation 2:
Eddy currents induced, induced magnetic dipole formed. Energy is lost as work has to be done to overcome the attractive/repulsive force due to the magnet and the induced magnetic dipole from the eddy...
I was thinking about the Gravity-B probe and the rotation of the satellite due to the Lense-Thirring effect. I was imagining that the satellite, once in orbit, was aligned to a distant star using retro rockets effectively rendering it non-rotating relative to that star. That being said, once...
I am given the answer is 2J and I know how to get there with U = q^2/2C. But what I don't understand is that why is the energy not conserved here? How can energy loses just because the capacitance is doubled?
Hi!.. As known, a certain amount of energy is applied for compressing a mechanical spring. Thus mechanical spring is charged with energy and it stores it as elastic-potential energy. But whole energy, applied for compressing spring, can not be converted into potential energy. The reason is...
https://www.asi.edu.au/wp-content/uploads/2016/10/ASOEsolns2012.pdf
Q11 D) Markers comments: Few students reached part (d) and very few of those who did realized that the amplitude does affect the time taken for each of Mordred’s bounces. i.e. the energy losses results in shorter periods...
When measuring pressure drop across a compressed air system shown in the included figure, I get different results depending on the system downstream of the actual component I am measuring pressure drop across. Btw this is a real experiment that has been ran. The numbers below are different but a...
Gravitational waves are produced by accelerating masses. Since all space is curved -- more curved near large masses stars, less curved in intergalactic space -- all moving masses are being accelerated to some degree. Do all moving masses therefore produce gravitational waves? If they do, will...
Suppose some protons are impacted on a Lithium target to produce neutrons with energies close to the proton energy. If one considers Energy-loss due to proton-target collision (ionization of the target atoms), will this kind of energy loss influence neutron energy spectrum?
I am asked by my...
Hello,
I just had a little debate with my professor after taking my final exam. He had given us an additional formula sheet at the last second (hand written on the projector) which confused me.
The question was a 7 MeV neutron collides with several U-238 atoms before reaching 2 MeV. How many...
Homework Statement
Problem: An object with mass 2.0 kg slides down a low-friction incline and its speed measured at the bottom is 2.7 m/s. The object starts sliding at a height of 0.50 m over the tabletop and its speed is measured 0.10 m over the tabletop. How big is the percentage energy loss...
Homework Statement
Homework Equations
y1 + P1/##\gamma##+v1/2g=y2 + P2/##\gamma##+v2/2g+hL
The Attempt at a Solution
I used the above equation and assumed that P1=0 and both velocity heads are equal. Is that valid? However I did not need to use the geometry of the pipe so I think I am doing...
What happens to the kinetic energy when an object is disintegrated? Does it survive?
For example, if I throw a baseball at the sun at 100 mph, I will get X amounts of heat energy released and X amount of light as it burned up before contact. If I threw another baseball 100,000 mph into the sun...
Hi,
I'm trying to simulate the process of charged particles attenuation in matter (like this) by a montecarlo-metropolis algorithm in Python. I thought that I could use for the number of particles at thickness ##x## the formula ## N (x) = N_0 e^{-\mu x} ##, so the probability in this case will...
How can I calculate the loss of potential energy when forces are applied but no motion in the system occurs? Here's an example:
Let's say I build a battery operated car that is set to drive forward, but I put it right in front of a wall. It attempts to drive forward, but instead it just pushes...
Homework Statement
why is there a loss of energy in DC circuits and power loss is reduced in AC when transmitted
Homework EquationsThe Attempt at a Solution
Loss of energy in a DC circuit is due to the resistance of the wire cauing the wire to heat up therefore energy is being lost by heat...
Homework Statement
Question: what rate does the water lose gravitational potential energy?
Data:
I have a pipe that water is flowing through and the pipe has 2 sections.
In section 1:
- the pipe is 11.9m above section 2 so, h = 11.9m
- the velocity of water is $$v_1 = 0.3240ms^{-1}$$...
Homework Statement
If the car is going 30 m/s half way up the loop and loses energy due to friction at a rate of 2.0J per meter of track, how fast will it be going at the top?
(this is question related to the loop of roller coaster track, with radius 20m.)
Homework Equations
1. Ki + Ui = Kf +...
A 2 stage compressor has a final delivery/discharge pressure of 250 bar.
hydrogen is been compressed and stored in vessels.
The pressure in the storage vessel reaches the delivery pressure(i.e.250 bar) and the compressor is still running ( vessel has a safety pressure of 450 bar) and the...
When a laser beam reflects during total internal reflection, how much of its intensity is lost?
I can't the use Fresnel equations as this is for total internal reflection.If you don't know the answer to the above question, what about the same question, but for mirrors instead?
What are the...
Homework Statement
Blobbing is one of the extreme attractions in aquaparks. A person is lying on a big raft positioned on the surface of water and filled with low-pressured air.
Another person jumps down from a given height onto the opposite end of that raft, throwing the lying person in the...
Homework Statement
Calculate the energy loss loss ##\Delta T## for protons, deuterons and ##\alpha##-particles between ##10## to ##200##MeV when they're passing through a 2mm thick plastic scintillator. Suppose ##Z/A=0.56##, ##I=65eV## and ##\rho = 1.10##g/cm^3.
Homework Equations
Bethe...
Hello everyone!
I previously opened a thread asking about sound wave energy loss in aluminum discs based on thickness. I am looking to find out more about exactly how much using a disc that is twice the thickness of the other, (one is 1/8" and the other is 1/4") sound energy would be lost using...
A uranium-238 atom can break up into a thorium-234 atom and a particle called an alpha particle, α-4. The numbers indicate the inertias of the atoms and the alpha particle in atomic mass units (1 amu = 1.66 × 10−27 kg). When an uranium atom initially at rest breaks up, the thorium atom is...
Hello everyone!
I am currently working on a project where I have a piezoelectric sound transducer connected to a glass tube via an aluminum disc. I got two aluminum discs with one twice the thickness as the other. I wanted to know which aluminum disc would work best, the thin one or the thick...
Homework Statement
1.) A 1200 kg car traveling at 20 m/s collides with a stationary 1400 kg car. The two cars lock together. Determine the speed of the vehicles immediately after the collision if 80% of the initial kinetic energy is converted to heat and sound during the collision
2.) Must all...
Hello, I was just wondering why is there an energy loss in helicoidal movement, specially in syncrotons. I know that there is energy loss because there is a production of X-rays, why this happens?
Homework Statement
This is a Lab:
A Ball is placed on a 14cm high ramp and it rolls down to the bottom of the ramp and onto a table where it rolls 20cm (the ramp's horizontal displacement is 16.5cm). After rolling on the table, the ball falls off the table for 76.5cm with a forward horizontal...
What about the structure of glass allows light to pass through, lose 10% of its energy then keep on going when all other object seem to absorb light. what makes clear objects structures so special.
When the lights goes through the (regular) glass and loses energy is it losing energy in the form...
I find most textbook explanations of resonance lacking. My understanding is that resonance occurs becuase less "driving energy" is lost when the driven frequency approaches the natural frequency of a system. But why does the energy loss curve like this? Since Q-factor is different for each...
Homework Statement
Hi, as a part of my lab report I have to conduct this experiment : Fill a pot with tap water and boil it, determine then how much of the energy that the kitchen surface produced, actually went to the water itself. Consider the water having an initial temperature of 10 °C. In...
Homework Statement
I am wondering how the mass of a ball affects the percentage of energy loss when the ball bounces.
Homework Equations
Ep=mgh
eff=eout/ein x 100%
The Attempt at a Solution
1)I don't think it affects them because if the ball is heavier but still made of the same material it...
I am wondering how the mass of a ball affects the percentage of energy loss when the ball bounces
1)I don't think it affects them because if the ball is heavier but still made of the same material it has the same elasticity and density only mass has changed. But if all of the starting Ep goes...
Hi,
If I have a ball at the top of a ramp, it will have rotational and translational kinetic energy as it begins moving. If the ramp was frictionless, just to confirm, would it be possible for the ball to rotate or would it just slide with the point of contact on the ramp fixed?
Also, if there...
I've been searching around the web to figure out why photons shift towards the longer wavelengths as they travel from stars and other light sources but I haven't figured out why they loose energy as they travel ( and after reading some web pages I was told that they don't even loose the energy...
1. Homework Statement
Express the beam energy loss in the accelerator in terms of the change in the beam momentum.
It is taken from one paper, where
\begin{equation}
\Delta T = \left( \frac{1+\gamma}{\gamma}\right) \frac{T_0 \Delta p}{p_0}
\end{equation}expression is used for transition from...
Homework Statement
Hello,I've always been told at school that conductors have resistance, and that resistance causes energy loss when current is flowing through the conductor, but I've never known the explanation behind that resistance.
Reading a little bit online, I saw 2 explanations:
1...
Suppose a block of 10kg at 10m/s collides into a block of 5kg at 0m/s.
Does a given percent of energy loss in the collision affect the final velocity of the blocks after the collision?
For instance, if there is no energy lost in the collision, would the final velocities be faster than if...
Homework Statement
Block m1 has mass 10kg and 10m/s
Block m2 has mass 5kg and 0m/s
Energy loss is 0%Homework Equations
Conservation of momentum
Conservation of energy
Quadratic Equation
The Attempt at a Solution
(mv)1i + (mv)2i = (mv)1f + (mv)2f
10(10) + 5(0) = 10(v)1f + 5(v)2f
v_{2f} =...
Homework Statement The question I have is not how to arrive at the correct values of final velocity, but once I have the values of final velocity, how do I know which velocities (which are computed from a quadratic equation) are correct?
Two blocks, block A and Block B, are traveling to the...
Homework Statement
A ball bounces down a uniform flight of stairs of height H , rising after each
bounce to to the level h of the previous stair .
the velocity of the ball before the impact is equal in all the impacts .
what is the average power of energy loss ?
Homework EquationsThe...
Today, I discussed my friend about two rigid beams impact and assuming no energy loss in the impaction.
As in the above figure, the upper beam move down with a uniform velocity ##v_c##, and hit a beam with ##0## velocity. After that the above beam will rotate and move away, which can be...