Bubble Definition and 221 Threads

I was looking for more details about this picture: I think I see a few places where electron/positron pairs arise but can't be sure. Does anyone know what types of particles (energies) are in this image.

Hi all. I'm looking for a paper that I've seen referenced in a couple of articles I've been reading. The paper is O. M. Kiselev, Determination of gas-bubble shape in axisymmetric flow of fluid, Zh. Prikl. Mekhan. Tekh. Fiz., No. 3 (1963). The English name of the journal is Journal of...

I was tackling a problem that came to my mind whether air bubble placed in water is converging or diverging lens. What I have concluded is that since bubble is sphere, we can assume it to be made of two similar plano convex lens. Now both of them will have same focal length but applying...

Homework Statement A scuba diver releases an air bubble of diameter 1.0 cm at a depth of 15 m below the surface of a lake. What will be the diameter of this bubble when it reaches the surface? Assume that the temperature of this bubble remains constant. Homework Equations p=F/A...

Homework Statement A scuba diver releases an air bubble of diameter 1.0 cm at a depth of 15 m below the surface of a lake. What will be the diameter of this bubble when it reaches the surface? Assume that the temperature of the bubble remains constant. Homework Equations The...

Dirac "bubble potential" Homework Statement Consider a radially symmetric delta potential V(r) = −Vo * δ(r − a) with l=0. How many bound states does this system admit? The Attempt at a Solution With l=0, the radial equation reduces to the one dimensional TISE. So, solving the 1D TISE with a...

I'm confused now... how can be antiparticles be detected in a bubble chamber which is made of ordinary matter? Why does a positron leave its trace interacting with the chamber gas without annihilating immediately?

This was written in python as an excersie, it's a terribly inefficient use of python. Still I don't understand why the sort doesn't stop as soon as possible can anyone one point out the error? def bubbleSort (theList): size = len(theList) - 1 while (size > 0): index = 0...

I'm a little behind on this topic. Will there be a student loan bubble burst? What consequences does that carry for students and everyone else? I don't understand why there would be a bailout? This might sound a bit idealistic, but could they stop collecting debts with percentage until a student...

Homework Statement While a person breathes in, a typical alveolus expands from a radius of 0.13 x 10-3m to 0.15 x 10-3m. The alveolus behaves as though it has a single surface which is described by P =2γ/r ote the following. The gauge pressure in the alveoli of the lung is denoted Palv...

"Diameter of a soap bubble increases when it is charged." why?

Max Tegmark has provided a four part taxonomy of multiverse theories (http://arxiv.org/abs/astro-ph/0302131). The first type can be labeled the "bubble universe" multiverse, in which universes like ours are scattered throughout an infinite space in every direction. Going the other direction...

"Banks lost, borrowers lost", then who won?

Hi, I am trying to write a program that sorts an array of random numbers. Unfortunately, it does not work out as i had hoped, I am getting some strange output. Here's my code: #include <stdio.h> #include <stdlib.h> /* Function Prototypes */ int rand(void); void srand(unsigned...

Why is the mass of air bubble in material medium considered to be negative?

Homework Statement A soap bubble of refractive index 1.33 is illuminated by white light perpendicular to its surface and viewed normal to its surface. What is the minimum thickness of the bubble for which brightly-coloured reflected light would be seen?Homework Equations \lambda=4ntThe Attempt...

Homework Statement A soap bubble of radius R_1 and surface tension \gamma is expanded at constant temperature by forcing in air by driving in fully a piston containing volume v. We have to show that the work needed to increase the bubble's radius to R_2 is: \Delta W=P_2V_2ln\frac{P_2}{P_1} +...

Came across http://www.independent.co.uk/life-style/gadgets-and-tech/news/investors-beware-is-the-new-dotcom-bubble-going-to-burst-2287159.html" in The Independent today. A lot of economists are predicting another DotCom crash, what with many people over-estimating the potential value of...

Rusi Taleyarkhan published many papers in pretty well-respected journals claiming that he was able to achieve hydrogen-hydrogen fusion using bubble cavitation/sonoluminescence. However he was found guilty of falsifying his research and got his funding revoked. Has anyone with a background in...

Anyone familiar with a bubble sort? and if so how to implement it?

if air is pushed inside a soap bubble then why does the pressure decrease ?

Hey. :) I am a Year 13 student and do not have to know anything about bubble chambers. However, they are mentioned in my textbook and I am interested in them. The textbook states: "Measuring the curvature of the tracks allows the charge and mass of the particles to be deduced. The spiral...

What does it mean for a bubble to be in equilibrium? I assumed it just meant that the forces expanding it and the forces compressing it were equal, hence it was at a steady radius. Is there more to it than that? I'm working on an EM problem so I don't think the specifics are important, I...

In the planted aquarium hobby, CO2 is often infused into the aquarium water using a compressed cylinder of CO2 which runs through a regulator, a needle valve, a bubble counter, and then into the tank. At the end of the gas line, a diffuser is used. The diffuser is porous ceramic material which...

Homework Statement A bubble in a glass of beer releases from rest at the bottom of the glass and rises at acceleration, a, to the surface in t seconds. How much farther does the bubble travel in its last second than in its first second? A) at B)(t-1)a C)(t+1)a D)(1/2)at Homework...

Homework Statement Consider a spherical bubble of radius R,rising in water. Using Bernoulli's equation show that the rate of rise of the bubble is: U=(2/3) \sqrt(gR) Homework Equations Bernoulli Equation Potential Flow The Attempt at a Solution I have considered the...

I was doing some online physics tests with my friend because we were bored and we both got stuck on this question, I was wondering if anyone might be able to help. A diver at 50metres under the sea (1.02 density) releases bubbles 1cm^3 in volume. What will the volume be when the bubbles reach...

Homework Statement An air bubble of radius R is formed on a narrow tube having a radius r where R>>r. Air of density ρ is blown inside the tube with velocity v. The air molecules collide perpendicularly with the wall of bubble and stop. Find the radius at which the bubble separates from the...

Homework Statement Two spherical soap bubbles of radii a[1] and a[2] are made to coalesce. Show that when the temperature of the gas in the resulting soap bubble has returned to its initial values, r of the bubble is given by p*r^3+4*\gamma*r^2=p(a[1]^3+a[2]^3)+4\gamma(a[1]^2+a[2]^2) where p...

This seems to be a very simple (stupid) question: If an inert gas is purged inside a distilled water container, bubbles are formed on the surface. The question is what are the constituents of those bubbles? and those constituents seems to be formed during a physical process, not a chemical...

Is it possible that a Type III Parallel Universe theory could accommodate the idea of universes being bubbles, with a semi-permable outer membrane, that sits in a hyperspace made of dark energy. During it's cyclic inflations and deflations, it could absorb (and expel, respectively) dark energy...

I read to today that soap bubbles explodes due to surface tension regardless of other forces experienced on the bubble. how does surface tension does that? does it "drive" the bubble to go larger until it explodes? Thanks, Omri

If the education bubble collapses, will it be the end of "blue skies research"? Okay, I know that this topic can be very sensitive to some people, and I really do not want to offend anyone. But it is something that concerns me, as someone who's interested in astrophysics, and I would like to...

More...

Hi all! Im a computer program that needs to simulate the motion of some bubbles. Id like to get a physically correct formula for my bubbles upward acceleration. I have a perfectly spherical bubble of air of known radius. It is submerged in water. Discounting any friction or surface tensiony...

Hi I need to calculate the force needed to move a water bubble inside a microchannel. Initially, the bubble is at rest and then the air pressure is increased on one side of the bubble. I am new in microfluidic and need some help about where to start in order to solve this problem. Thanks

Homework Statement My teache recently assigned this problem but its nothing like the atmospheric problems we've done in class. Any suggestions on where to start? The cross section of the tube of a mercury barometer is 1 square centimeter, and when the barometric height is 760 millimeters...

At 24.0 m below the surface of the sea (density = 1025 kg/m3), where the temperature is 5.00°C, a diver exhales an air bubble having a volume of 0.90 cm3. If the surface temperature of the sea is 20.0°C, what is the volume of the bubble just before it breaks the surface? _______ cm^3

Homework Statement A bubble with a volume of 1.00 cm3 forms at the bottom of a lake that is 40 m deep. The temperature at the bottom of the lake is 10°C. The bubble rises to the surface where the water temperature is 31°C. Assume that the bubble is small enough that its temperature always...

In thinking about QM, I was wondering if anyone could comment on this? Back in prehistoric times, I did research using bubble chambers. In a bubble chamber, you see a number of curved (because of the magnetic field the chamber is imbedded in) tracks corresponding to different particles...

Homework Statement In the lab, i saw that when Mg(s) attach with Fe(s) nail in a yellow solution( probably indicator), after one day, the brown substance and bubble are formed. My net ionic equation is SOA: O2(g) +2H2O(l) +4e -->4OH- SRA: Mg(s) --> Mg2+ +2e NIE: O2(g) +2H2O(l) +2Mg(s)-->4OH-...

Homework Statement A bubble of air which is 1 mm in diameter is released without initial velocity in the volume of glycerol at room temperature. Describe the motion of the bubble as a function of time assuming that its diameter remains unchanged. Note that friction force acting on the...

[b]1. The problem. Okay, here's the question: 'An air bubble situated at the bottom of an open kerosene tank rises to the top surface. It is observed that at the top, the volume of the bubble is thrice it's initial volume. If the atmospheric pressure is 72cm of Hg, and mercury is 17 times...

Hi! Let's say I have a bubble chamber and a particle traveling in it. I know the trajectory of the particle, because I can see the bubbles. But if I measure the time elapsed between the appearance of the first bubble and of the last one, I know how much time the particle took to follow the...

I'm curious, is there a "Ph.D. bubble" in math that is similar to the one in physics? Specifically, what percentage of graduating math Ph.D.s end up getting tenure?

[SOLVED] Index of refraction Homework Statement An air bubble inside an 9.00 cm-diameter plastic ball is 2.90 cm from the surface. As you look at the ball with the bubble turned toward you, how far beneath the surface does the bubble appear to be? Homework Equations n_1/s + n_2/s' =...

Has this type of experiment ever been performed? Firing electrons one at a time we can easily get the which-path information and see if interference dissapears or not. What actually happens? Also, if we do the double slit experiment with a usual laser but in a smoked environment (in order to...

How can I understand the bubble nucleation in the process of phase transition? Are there any analogs or clear figuration? Thanks!

Homework Statement The initial volume and depth of the gas bubble is V0 and H respectively. The bubble has a mass M and the gas can be assumed to be ideal. The gravitational field strength is a constant g. And the density of water is Dw. What then, is the time taken for a bubble initially at...

Is it true that the housing bubble was created because the housing market was practically 100% unregulated?