Alpha particles are the least penetrating of the primary particles because they have the most mass and the most charge. They can be stopped with only a few inches of air, or even by a sheet of paper.
A sheet of notebook paper will stop alpha particles. Depending on their energy, alpha particles, which are helium-4 nuclei (two protons and two neutrons), will only travel a few feet in air. Use the link below to learn more.
Notebook paper is not able to stop alpha, beta, or gamma radiation due to its thinness and composition. These types of radiation can easily pass through materials like paper.
The "speed" of an alpha particle will be determined by what it is that generates that alpha particle. That's another way of saying that alpha particles, which are helium-4 nuclei, come in different energies. You will recall that they are generated in alpha decay, which is a form of radioactive decay. As to how "fast" they are in water, all we can state is an initial energy, and then do some calculations to determine how far they might go. As a sheet of notebook paper will stop an alpha particle, it will not travel very far in water. Small fractions of an inch is all we could expect for the distance they'd be able to go. Heck, they'd be bumping into water molecules right from the gate, and losing energy with each collision (which is called a scattering event). Links to related questions can be found below.
Not much. A sheet of paper will stop it. The alpha particle is two protons and two neutrons - a helium-4 nucleus. As radiation goes, it's big and fat, and it will "run into" stuff even if it's just flying through air. Depending on its energy, it can penetrate air, but not more than a few inches.
Alpha particles are the least penetrating of the primary particles because they have the most mass and the most charge. They can be stopped with only a few inches of air, or even by a sheet of paper.
A sheet of notebook paper will stop alpha particles. Depending on their energy, alpha particles, which are helium-4 nuclei (two protons and two neutrons), will only travel a few feet in air. Use the link below to learn more.
Delta waves, the slowest brainwave pattern, can effectively stop both alpha and gamma waves as they dominate during deep sleep and unconscious states. External factors such as strong electromagnetic fields or disruptions to the brain's natural electrical activity can also interfere with alpha and gamma wave patterns.
Paper is not effective at stopping gamma rays as they are highly penetrating electromagnetic radiation. Materials such as lead or concrete are more effective at blocking gamma rays due to their higher density.
Paper can stop alpha particles because paper has a higher density compared to air, which makes it more likely that the alpha particles will collide with the atoms in the paper, losing energy and stopping their movement. Additionally, the small size of alpha particles means they are easily absorbed by the materials they come into contact with.
paper and flesh
A lot of things, but I think you might be referring to which form of radiation since this is the classic answer as to what would stop Alpha radiation. Furthermore tinfoil would stop alpha and beta radiation and lead would stop alpha, beta and gamma radiation.
Notebook paper is not able to stop alpha, beta, or gamma radiation due to its thinness and composition. These types of radiation can easily pass through materials like paper.
A few millimetres of lead.
Alpha particles have very little penetrating power. A sheet of newspaper is sufficient to stop them, and they only travel a few meters (at best) in air. Let's look at the alpha particle. The alpha particle is a pair of protons and a pair of neutrons. It's actually a helium-4 nucleus, and it comes away from another atomic nucleus when that nucleus undergoes alpha decay. But though the alpha particle is moving pretty quickly (has a lot of kinetic energy), it "slams into" atoms in air as it is going, and these collisions (called scattering events) take energy from the alpha particle. That particle will "disappear" after moving only a short distance in air, and then capture a pair of electrons from somewhere to begin a life as a helium-4 atom. Alpha particles only travel a few meters in air, and will be stopped by a single sheet of newspaper.
Alpha particles are the least penetrating, and are not able to pass through a single sheet of paper. Beta particles can penetrate through a sheet of paper, but not a piece of aluminum. Gamma rays can travel through both paper and aluminum and it takes dense material like lead to stop them or reduce their number. Gamma rays are high energy electromagnetic rays.
The "speed" of an alpha particle will be determined by what it is that generates that alpha particle. That's another way of saying that alpha particles, which are helium-4 nuclei, come in different energies. You will recall that they are generated in alpha decay, which is a form of radioactive decay. As to how "fast" they are in water, all we can state is an initial energy, and then do some calculations to determine how far they might go. As a sheet of notebook paper will stop an alpha particle, it will not travel very far in water. Small fractions of an inch is all we could expect for the distance they'd be able to go. Heck, they'd be bumping into water molecules right from the gate, and losing energy with each collision (which is called a scattering event). Links to related questions can be found below.