What is Ray: Definition and 516 Discussions

Finland's Slot Machine Association or RAY (Finnish: Raha-automaattiyhdistys) was a government-supervised and -owned nonprofit gaming (gambling) association (statutory corporation) in Finland. On January 1, 2017 RAY merged with the government-supervised and -owned nonprofit betting agency Veikkaus and Fintoto. The new company that was founded as a result is also called "Veikkaus". RAY was a gambling monopoly whose proceedings went to domestic charity such as pensioner care and gambling addiction treatment. While RAY was best known for its slot machines, the company also dealt in online gambling and controlled the only official casino in Finland, Casino Helsinki.RAY's operations were governed by legislation and decrees. The operations of the other Finnish gaming organisations, Veikkaus and Fintoto, are also based on the Finnish Lotteries Act. The act was last amended in 2012.RAY's revenue came from slot machines, casino games, and casino and digital gaming. All the proceeds from RAY's gaming operations were used to support Finnish health and welfare, and these funding decisions were also based on legislation.The history of the Tuplapotti predecessor, the Potti game, dates back to 1986, and in the 1990s a newer version of it was developed that rose to much greater popularity than its predecessor. The game was developed by Veikkaus (by then known as RAY), and the game is still one of the favorite gambling games in Finland.

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  1. S

    Gamma Ray Ionization Path to Overcome Potential

    If a gamma ray is being fired and is in turn colliding with electrons and ionizing the electrons in the gamma ray path, where do the electrons tend to? In what direction is the current most likely to flow for a high powered gamma ray ionization?
  2. Saitama

    Ray optics - Reflection from sphere

    Homework Statement A light ray parallel to the x-axis strikes the outer reflecting surface of a sphere at a point (2,2,0). Its center is at the point (0,0,-1). The unit vector along the direction of reflected ray is ##x\hat{i}+y\hat{j}+z\hat{k}##. Find the value of ##yz/x^2##. Homework...
  3. D

    Is the Modified Lagrangian Formula Correct in Ray D Inverno Problem 11.5?

    i have a doubt in this problem ; is correct say that : L_m(y) = L(y) + δL(y) = L(y + δy)= L(y) + δy(∂L/∂y) ?? where L_m is modified Lagrangian and y is dynamical variables. I get answer but i have it doubt.
  4. N

    Information carried by ray of light

    Does the light ray that had hitted a body carry the information about the body that it has hitted? Because when we see our own image in a mirror the image is same as of us. so do the photons of light carry information about the part from which they are reflected? thanx
  5. K

    Ray diagrams for an astronomical telescope

    Homework Statement An astronomical telescope is constructed using 2 convex lenses. The objective lens is of focal length 40cm and eyepiece lens is of focal length 10cm. Let d be the distance between the 2 lenses. Draw ray diagrams for the following situations. 1.When d=50cm 2.When d>50cm...
  6. T

    Ray tracing through optical system of thick lenses

    Can you advise me a free software that allow to draw rays passed throught system of thick lenses (preferable in 3D)?
  7. Y

    Understanding the Concept of Ray of Light and Diffraction at Small Apertures

    I can't get the concept why there is no diffraction when lambda tends to 0 even for extremely small aperture.please explain simply.
  8. nsaspook

    News Remembering Ray Harryhausen: A Master of Movie Magic?

    http://www.bbc.co.uk/news/entertainment-arts-22441567 One of his best:
  9. G

    How to measure the location of Gamma ray burst ?

    I have read articles about the GRB measurement using X-ray from afterglow. The article tells that the gamma ray provides poor directional information.Why? How can we use X-ray for measurement?
  10. skate_nerd

    Deflection of electron beam in cathode ray tube

    Homework Statement Part a) Deflection of the electron beam in a cathode ray tube television set has electrons accelerated until they have K.E. of 25 keV. What is the magnetic field magnitude required to deflect the electron beam 3.3 cm when the magnetic field is 8 cm long? Part b) When...
  11. S

    Work function and energy of X ray photon emitted by anode

    Hi guys, I'm constantly bothered by one assumption in my textbook..it says that the photon emitted by the accelerating electron boiled off from the cathode colliding into the anode, has E=hf neglecting the work function, since its negligible. I'm curious whether it's E=hf plus or minus the work...
  12. A

    The Mystery of the Creeping Ray & Relativity

    I have been doing many experiments with light and magnetism, and one of the things I noticed is that when light is passed on the right side of a sphere (e.g.) some of the laser rays will deflect from a straight path and bent towards the left. I believe this is known as the "creeping ray"...
  13. K

    Understanding ray diagrams for concave lenses

    Hey guys, So some friends and I are studying for a test and we came across this question. I've absolutely no idea what the answer is simply because every website I've found only shows parallel rays and a ray going through the centre of the lens. It's incredibly aggravating. Anyway here's the...
  14. E

    Does this mean the speed of x ray faster than light in vaccum

    http://global.britannica.com/EBchecked/topic/495677/refractive-index refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another. If i is the angle of incidence of a ray in vacuum (angle between the incoming ray and the...
  15. L

    How far is the ray displaced as a result of traveling through the gla

    1. A ray of light passes from air through dense flint glass and then back into air. The angle of incidence on the first glass surface is 63.5°. The thickness of the glass is 4.26 mm; its front and back surfaces are parallel. How far is the ray displaced as a result of traveling through the...
  16. T

    Solving Ray Optics Problem 2: Mirror Positions and Image Formation

    Hi friends, Please help me in answering this problem The problem is as follows, https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-prn1/s480x480/11130_2937865262994_1085043361_n.jpg Well, Friends when the lower mirror would be at position 'A', which is moving in the upward direction...
  17. T

    Solving Ray Optics Problem: Understanding Refraction and Deviation

    Hi friends, Please help me in answering this problem The problem is as follows, https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-ash3/s480x480/557923_2937818221818_1718139220_n.jpg Well, As far as I am concerned, When white light fall on the first surface, after refraction...
  18. S

    Can Protons Travel as Rays in Space?

    can proton particle like alpha particle travel as rays in space?if yes, how are this rays produced in nature and artificially by man?
  19. D

    Can a topologically bounded set in a tvs contain a ray?

    Pretty much what the title says. Suppose we have a topological vector space $(X,\tau)$ and $U\subseteq X$ is topologically bounded. Is it possible for there to be some $x\in X$ such that $cx\in U$ for arbitrarily large $c$? I'm thinking of a real vector space here. If we try to prove...
  20. S

    Why if a ray pass though different materials its direction changes?

    Hello, why if a ray pass though different materials its direction changes ? couldn't its propagation speed just increase or decrease without having to change the angle ? Thank you
  21. Islam Hassan

    Balloon-Borne Cosmic Ray Collision Detectors vs Earthbound Colliders

    If cosmic rays include particles with energies way way beyond what is achievable with classic colliders like the Tevatron and LHC, why not build light collision detectors and have them carried aloft. AFAIK altitudes of 20km-50km are possible with present high-altitude balloon technology. At such...
  22. R

    Why Does a Ray of Light Not Get Refracted at the Optical Center of a Convex Lens?

    I'd like to know why a ray of light passing through the optical center of a convex lens does not get refracted at all. According to my knowledge, a ray of light will not get refracted if the angle of incidence is zero i.e. it is along the normal. With this in mind, I see how a ray traveling...
  23. C

    Ray tracing - how to numerically integrate the equation of the ray

    In a continuous isotropic medium having refractive index n, (not constant) the ray path can be described by the following equation d/ds(n dr/ds)) = grad (n) with an obvious meaning of the symbols (for they who can help me!). I wrote a code to calculate the ray path. I found result...
  24. W

    Find the object location with ray optics

    Homework Statement A 1.0-cm-tall object is placed 4.0cm from a diverging lens of focal length 6.0cm. Using both ray tracing and the thin lens formula, find the location and orientation of the image. Homework Equations -1/f = 1/so + 1/si m = -si/so = hi/ho The Attempt at a Solution...
  25. H

    Light ray passing thru plastic block

    Homework Statement A light ray passes downward into a block of transparent plastic with an angle of incidence of θ1 = 77.7°. If total internal reflection is to occur when the light strikes the left edge of the block at interface B, what is the index of refraction of the plastic? Homework...
  26. D

    The 'fermi Line' (the 130 GEv gamma ray signal)

    http://arxiv.org/abs/1206.1616 Strong Evidence for Gamma-ray Line Emission from the Inner Galaxy - Meng Su, Douglas P. Finkbeiner Analysis of data from the Fermi telescope shows "monochromatic" gamma ray emission at 130 GeV from the centre of the galaxy. This paper is generating a lot...
  27. S

    Why cosmic ray intensity needs correction with pressure?

    Hi guys, I cannot understand why we need to correct cosray intensity with pressure and why the equation that describes the phenomenon is I=Io*exp(-a(Δp))? I want to know the phsyical meaning of this(i assume,experimental) result... Thank you...
  28. S

    MHB Reflecting Ray from Concave Mirror: Parabola Focus

    A ray of light is coming along the line $y=b$,($b>0$), from the positive direction of the x-axis and strikes a concave mirror whose intersection with the $x-y$ plane is the parabola $y^2 = 4ax$,($a>0$). Find the equation of the reflected ray and show that it passes through the focus of the parabola.
  29. T

    Why are all non-principal sagittal rays considered skew?

    According to Wikipedia: The part I don't understand is why all rays that are sagittal rays that are not the chief/principal rays must be skew. Do they just mean all other rays originating from the same object point must be skew? Because that makes sense. Are these things always discussed...
  30. S

    Gamma Ray Laser, possible? Superior Weapon?

    Hello there. I am wondering if anyone can shed some light on this topic. I am searching all over the Internet to find reliable sources on the possibility of gamma ray lasers. I know that it requires an atom that can be "pumped" without spontaneously emitting its energy so it can be triggered by...
  31. R

    K-40 Gamma Ray Branching Ratio: 10.67%

    what do u mean by gamma ray branching ratio of 'k-40' is 10.67%?
  32. S

    Gamma ray pulse height spectrum

    Homework Statement A radioactive source which is known to emit gamma rays only at a single energy is placed in front of a gamma ray detector. The gamma ray pulse height spectrum shows three distinct pulse heights of 7.38,6.49 and 5.60 volts. What is the energy of the gamma ray? The Attempt...
  33. Faradave

    Ray vs. Line: Equivalent Freedoms?

    I’m curious, but no mathematician. Euclidean geometry is the only type for which I've had training (45 years ago). Apologies in advance for misused terms. A line, as I recall, extends indefinitely in opposite directions. It has no definite “origin” or "center". If we view “translational...
  34. C

    Cosmic ray induced nuclear fusion

    Has anybody thought of it before? I mean even if it were energetically expensive to harness it it might actually create more than it takes since the energy source is raining down from the heavens anyway. Such a power plant would have to be placed at a high altitude though because most cosmic...
  35. T

    Gamma Ray Energy from Decay of Boron

    Homework Statement I have to figure how many beta particles are released and how much energy is released as gamma rays in the complete decay of 1000 atoms of (12/5) Boron. Homework Equations Mass of one boron atom is 10.811 g. I think we may be able to use E = mc^2 somehow but I'm not sure...
  36. S

    Photonics: Ray Reflection Question

    The question can be found at this link: http://gyazo.com/ee82873af32d76898ab1c5b9f058a2eb My reasoning for part A follows as such: Because the radius of curvature is smaller in the second mirror than in the initial elliptical mirror, every point on the second mirror (other than the tangent...
  37. M

    Ultra-high-energy cosmic ray ≠ collision of 2 'normal' rays?

    Hi, I have a rather basic question: most 'cosmic rays' have an energy of about 109 eV, but there are also 'Ultra-high-energy cosmic rays' with an energy of around 1019 eV to 1020 eV, so I was wondering if they couldn't be the result of collisions of two 'normal' cosmic rays that hit each...
  38. L

    Gamma ray colliding with an electron

    Homework Statement A beam of gamma rays of energy 1.00 MeV are aimed at a set of freely moving gold particles. The gamma rays reflected back have an energy of 0.2035 MeV. How is this result consistent with the model of a gamma ray reflecting from an isolated electron initially at rest...
  39. A

    Deriving the Deflection Equation for a Prism

    Homework Statement The problem I am having troubles with is proving the deflection of a ray by a prism can be represented by a specific equation : θd = θ - α + arcsin(sin(α)√(n2 - sin2(α)) - sin(α)cos(α)). I have derived another form of the deflection equation for a prism and I am attempting...
  40. D

    Gamma Ray Microscope: Can it be Directed and Focused?

    I was in my AP Physics class discussing wavelengths of the electromagnetic spectrum and I came up with the idea to attempt a gamma ray microscope. Of course this is extremely dangerous, so I will have to be cautious (and use a lot of lead). Is there a way to produce gamma rays? I know they...
  41. A

    Alpha ray scattering experiment

    I have some basic doubts in the alpha ray scattering experiment by Rutherford and his students way back in 1909. 1.In the formula for the distance of the closest approach, the term velocity of the alpha particle and the charge of the gold nucleus appears. How did they measure the velocity of...
  42. J

    Is it possible I saw a luminous cosmic ray track?

    Last month my sister and I were driving down a Maine highway to visit relatives up North. As we were chatting, I saw a perfectly straight, narrow, luminous line appear momentarily in front of the tree line (on the order of 100 meters away). It lasted just long enough to see and then it was...
  43. A

    Cathode Ray Tube: Explaining Phenomena with Green Beam and Fluorescent Glow

    In a video demonstration (not animation), cathode rays appear as a beam of green light moving from the cathode to anode inside the tube. The demonstrator brings a magnet near the tube and the green beam deflects. This I can understand. What I can not understand is that how the electron beam...
  44. Andre

    Where's Our Resident Ray of Sunshine?

    It appears that our resident ray of sunshine is missing in action or absent without leave. Last seen online a day and a half now, while she seemed never to be offline before. We noticed this: Anybody have more info? :confused:
  45. V

    Voltage spawning a cathode ray

    In descriptions of the cathode ray, various sites mention how the ray is formed from a voltage applied to the tube which spawns the ray on sees in the vacuum tube. Could someone elaborate on how a voltage can spawn this beam? As in, where does the potential difference come from and so on...
  46. A

    Gamma Ray Decay to potential watts

    I'm interested in calculating how much power (in Watts) could be produced (assuming a 100% conversion efficiency between Gamma Rays and electrical power) from gamma decay of a 60 Co -> 60 Ni. How long would this reaction last? Just a few seconds or longer? Are there any decays that last for a...
  47. C

    Assumption that Anti-Matter Galaxies Would Emit Detectable Gamma Ray Bursts

    In the hunt for antimatter galaxies, the tools that we are currently using look for gamma rays that would be emitted due to annihilation events, because everything else about these galaxies is predicted to be the same emission-wise. The hypothesis is that these annihilation events would occur...
  48. S

    Why Do We See So Many Gamma Ray Bursts?

    So, if my understanding of GRBs is correct, they are a collimated jet of material that produces a lot of gamma rays. So my question is, don't these have to be pointing right at us for us to see them? If so, then why do we see so many? I think it's at around at least one per day, the last time...
  49. lisab

    Ray Bradbury Dies: Celebrating the Life of Literary Pioneer

    When I was a youngster, "The Martian Chronicles", "The Illustrated Man", and "Fahrenheit 451" were all required reading for us nerdy types. RIP, Mr Bradbury! http://www.reuters.com/article/2012/06/06/entertainment-us-usa-bradbury-idUSBRE8550UC20120606
  50. jssamp

    Displacement of emerging light ray

    Homework Statement A light ray is incident on a flat piece of glass with index of refraction n. Show that if the incident angle θ is small, the emerging ray is displaced a distance d = tθ(n - 1)/n form the incident ray, where t is the thickness of the glass and θ is in radians. Homework...
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