Rays Definition and 315 Threads

The problem comes with solutions. However, I dont get the 3 steps in the solutions. Why do they calculate decay for 120min in step 3? And why is only the daughter nuclide relevant and no granddaughter? There might be something lacking in my knowledge about nuclear reactions. Also, I don't know...

Hi. I use Matlab to simulate that two parallel light rays pass near a Kerr BH. The angular momentum of the BH points to the ##z## direction. The ##z## components of the start points of the two rays are ## 1\times 10^3 ~\rm{m}## and ##- 1\times 10^3 ~\rm{m}##, respectively. The result, as shown...

Astronauts heading towards Mars (and hopefully return) will need protection against the harmful effects of gamma rays in space for this long trip. Apparently, much shorter trips have not caused enough bodily harm to be of much concern. However, a 6-month or longer trip might be a real problem. I...

I was reading about characteristic x rays. I have a question I did not find an answer for it in the book (Concepts of Modern Physics-Sixth Edition-Arthur Beiser) or in the internet search. My question is: How do the atom in the target (in the x ray production experiment) go to the normal state...

I read in the following book A history of the sciences by Stephen F. Mason. About the discovery of the electron the write what I attached in the picture. I wonder what do these positive rays traveling in the opposite direction they talk about consist of? Some ions or what? I understand that the...

I really tried to solve it a lot and the info that I gathered is : Electrons or protons can be ABSORBED by cathode or anode so there must be some hole in the electrode for the rays to pass. These electrons ionize the gas and those positive gas ions move towards cathode.

Hello, I would like to ask, why there cannot be detected cosmic rays with energies higher than ~ 10^20 eV, i.e. beyond the GZK limit? Thanks a lot in advance for the answer.

I need to show the following thing: Given a collection of 5 rays (half-lines) in the plane, show that it can be partitioned into two disjoint sets such that the intersection of the convex hulls of these two sets is nonempty.

Ok so if an object is placed at the focal point of a convex lens, it will have it's rays collimated -- which I assumed to mean that all rays would end up parallel to each other. But then, I saw this diagram of a simple compound microscope from Hecht "Optics" 5th ed: And I noticed that all...

The attached diagram shows the cathode rays moving in straight lines forward but the anode is beneath them?

I had thought that cosmic rays were all protons, but this article says sometimes it's iron. https://getpocket.com/explore/item/let-s-colonize-titan

I had thought that cosmic rays were protons, but this NY Times article seems to say that cosmic rays are neutrinos: https://www.nytimes.com/2021/03/30/science/neutrinos-lake-baikal.html

https://www.nature.com/articles/s41586-020-03173-9

Take a medium with ##n = n(y)## and define the functional as usual$$T[y] = \int_{\mathcal{C}} \frac{ds}{cn^{-1}} = \frac{1}{c} \int_{x_1}^{x_2} dx \, n(y)\sqrt{1+ y'^2}$$along ##\mathcal{C}## between ##\mathcal{P}_1 \overset{.}{=} (x_1, y_1)## and ##\mathcal{P}_2 \overset{.}{=} (x_2, y_2)##...

Both alpha and beta radiations can only travel short distances through air as they're not as penetrating as gamma radiations. How long gamma radiations with 22 MeV energy can travel in air? Is it meters, kilometers, miles, etc. Is there a difference between a lower energy gamma ray and a higher...

According to https://apps.dtic.mil/dtic/tr/fulltext/u2/a351472.pdf the big pulsed power accelerator, HERMES III, generate electron beam with peak energy at 22 MeV and average electron energy at 16 MeV and the resulting photon energy which is bremsstrahlung radiation is approximately 2 MeV...

Some people said if it is originated from electrons then it is X-ray but if it is originated from the nucleus it is Gamma ray. But people can produced X-rays and Gamma rays by Bremsstrahlung process and in Bremsstrahlung process it is resulted from decelerating or braking electrons. So, Gamma...

According to this link https://apps.dtic.mil/dtic/tr/fulltext/u2/a351472.pdf, HERMES III at Sandia National Labs can generate very large area gamma rays by converting the electron beam into bremsstrahlung radiations after hitting the tantalum target. As we can see in the isodose contours in the...

According to https://www.osti.gov/servlets/purl/7234564, the HERMES III which stand for High Energy Radiation Megavolt Electron Source accelerator is "capable of delivering a peak dose of ~100 krad (CaF2) over a useful area of ~1000cm2 (area where dose is greater than 50% of the peak dose) in a...

Hi: Source: https://en.wikipedia.org/wiki/Radium Question 1: I think that the first statement suggests that it's the emission of alpha particles, beta particles and gamma rays which raises the temperature of radium sample; possibly on their way out from the sample, those particles and gamma...

I am a Junior UG student in Physics. We have an introductory course on astrophysics. It includes modules on cosmic ray and magnetic field in galaxies. I have a basic acquaintance with QM (up to Hydrogen atom problem). I also had a course on basic particle physics. (Very rudimentary. Mainly intro...

Hi all! Breaking down the question bit by bit: AC is coated with a silver film which acts as a mirror - Okay, nothing as of yet right..? A light beam is an incident onto prism at Point Q such that angle PQB is 40 degrees - This means that my incident angle is 50 degrees as shown below...

https://www.businessinsider.com/we-may-be-living-in-the-matrix-2013-11 can an experiment with cosmic rays prove or disprove the hypothesis of simulation?

What sort of properties would you expect from gamma rays, as you increase their energy, and why? Would they penetrate high Z-matter more easily? What would be the outcome of the interactions? Do you expect photoelectric and Compton scattering processes to become negligible, and the dominant...

I understand the concept that a more energetic photon would cause more ionization events and therefore we can estimate the original energy of the incident photon. But what I don't get is that in practice, you don't get one photon entering the detector at a time, you get a whole bunch of them...

i already know radioactivity produces gamma rays. Are there other ways to produce gamma rays in a laboratory, without radioactive substances?

We can see wave length that get compress and get higher in height when they get high energy so how would wavelength react and it how it would look like when it gets high amount of energy(like infinite energy)?

I've tried to attempt the first part of the problem(spent over an hour on this) as second part could be easily optained with some calculus ,I asked my friend but alas nobody could conjure the solution to this dangerous trigonometric spell. It was just pages and pages of concoction of...

I found this link off of a politically charged website (of the persuasion to deny that Global Warming exists), so I am apt to be skeptical. (The website is hosted at the Northern Marianna Islands, making me even more suspicious.)...

is there some physical limit on the wavelength of electromagnetic radiation? Can there be radiation shorter than gamma rays?

I am studying the fact that two events that are simultaneous in a frame aren't (in general) simultaneous in another. The lamp is equidistant from the two ends. When the light is switched on an observer on the train sees how both light rays hit the back and the front of the train...

Any theory what could be causing the excess gamma ray and the strange dips in the sun? https://www.quantamagazine.org/gamma-ray-data-reveal-surprises-about-the-sun-20190501/ "A decade’s worth of telescope observations of the sun have revealed a startling mystery: Gamma rays, the highest...

So I worked out the first part and obtained ##E_1 = 478.8MeV##, ##E_2 = 459.4MeV## and ##p = 0.49 MeV/c## but I can't quite wrap my head around the second part. Normally, I'd use the equation for s but I'm confused since I don't know the angle between the gamma rays.

The problem relates to birefringence and crystal optics. What is the difference between O and E rays to S and P polarizations? Is O-ray just a different name to S-polarization and E-ray a different name to P-polarization? if not, what is the difference?-

Dear community, I am Pedro de la Torre, now doing my PhD on Cosmic ray propagation. Now, I have started to study reacceleration due to interactions of CR with plasma waves. My problem is that I do not find neither a good book or any kind of review with a detailed demonstration on the...

In the ray model of light we learn that two light rays don't interfere with one another. That is one crosses the path of the other and both follow their path as they were doing before. In terms of quantum theories could we say that in this situation the electromagnetic field is not interacting...

Hi I was wondering what would happen if you use Gamma Rays in a double slit experiment. Would you see the same interference pattern?

is it possible, i mean can we hold it at a certain distance we want ?

My concerns are all about how much shielding would be needed for a nuclear reactor. Would aneutronic He3-He3 fusion produce less energetic photons than fission to be more easily used in more mobile reactors? Obviously very few neutrons are made in this reaction so that leaves the high energy...

Hello, I didnt understand what the "critical" in critical rays are. I didnt understand the meaning. Can someone help, please. Thanks.

Hello, Recently, a solar power tower plant was founded next to where I work. Since it's the tallest object in the area, it's quite hard to miss it. But apart from that, every morning the reflected light is arranged in a hyperbolic- like way, as you can see in the picture. Does anyone have a...

Hey all, In chapter 6 section 3 of Modern Optical Engineering, 4th edition, by Warren J. Smith, it claims you can calculate all the 3rd order aberrations by considering two paraxial rays. I'm trying to convince myself of this and not having much success. Unfortunately, the article that this...

When the sun's rays break through a cloud there appears a radiating pattern but if one drew a line through these rays they would meet much closer than the distance to the sun. How come?

Sorry for the vague title; I couldn't think of a better one. I have been looking for information about how frequently one could expect cosmic rays (of all types) to hit and be absorbed by a piece of silicone (say 5x5x0.5 mm3) at the surface of the Earth. But haven't had much success. I know...

While lying in front of a 500 degree woodfire, I wonder if besides light and heat that we take as ordinary does it also have ultraviolet rays of light like the sun?? What are the types from light from an ordinary on Earth fire?? Would they be beneficial to plants as main light source?, would...

My book says that the Sun's rays reaching us are always parallel. See this image Are the Sun's rays reaching us always **PARALLEL rays**? I will be thankful for help!

Lets say you have your basic fusion reaction D + H → He3 + γ + 5.49 MeV Now exactly how much of the energy is carried away by the gamma ray and how much by the Alfa particle ?

I am not sure if this is entirely correct, but first I am going to say that life on Earth mostly thrives in the visible range of the electromagnetic spectrum, and perhaps some infrared and ultraviolet (for some creatures), because it is the frequency range that they were the most exposed to...

Hey guys! I am trying to simulate distribution of cosmic ray particles, which change their trajectory due to planet's magnetic field (no atmosphere; dipole approximation). I tried considering protons with non-relativistic velocities, falling on an Earth-like planet, which has rotational axis...

Homework Statement The problem asks: The index of refraction for violet light in silica flint glass is 1.66, and the index of refraction for red light is 1.62. What is the angular spread of visible light passing through a prism of apex angle 60 degrees if the angle of incidence is 50.03...