When a beam of silver atoms was passed through a specially shaped magnetic field, the beam was split based on the direction of an atom's angular momentum, or spin.

When particles in a beam are thrown against a foil made of a certain substance, the cross section is a hypothetical area measure around the target particles of the substance ( usually its atoms ) that represents a surface.

When looking at a cross section of a beam of light, the length over which the phase is correlated is called the transverse coherence length.

When it emerges from the specimen, the electron beam carries information about the structure of the specimen that is magnified by the objective lens system of the microscope.

When the electron beam interacts with the specimen, it loses energy by a variety of mechanisms.

When a beam of light crosses the boundary between a vacuum and another medium, or between two different media, the wavelength of the light changes, but the frequency remains constant.

When it is turned on, the copper has three states ; either reading an instruction, executing it, or waiting for a specific video beam position.

When the reflector is moving at right angle to the radar beam, it has no relative velocity.

When struck by a beam, a catalytic function causes the beam to change its form.

When a beam of white light passes from air into a material having an index of refraction that varies with frequency, a phenomenon known as dispersion occurs, in which different coloured components of the white light are refracted at different angles, i. e., they bend by different amounts at the interface, so that they become separated.

When the Enterprise-E arrives to do battle with the Narada, Nero agrees to beam Worf over if the ship will lower its shields.

When the group's ship suffers a warp core breach and is going to explode, he offers to beam them aboard his ship so they can survive, but they refuse and tell him to move off to a safe distance which he does.

When the waves are steep, it may be necessary to sail closer to the wind to avoid waves directly on the beam.

When first used by Commander Linx in The Time Warrior, it shows the ability to fire a beam which can disarm by knocking the weapon out of the wielder's hand, hypnotise, as well as cutting through wood and killing.

When the primary electron beam interacts with the sample, the electrons lose energy by repeated random scattering and absorption within a teardrop-shaped volume of the specimen known as the interaction volume, which extends from less than 100 nm to around 5 µm into the surface.

When all parts of the detector are used to collect electrons symmetrically about the beam, atomic number contrast is produced.

When a light beam crosses a boundary between materials with different kinds of refractive indices, the light beam will be partially refracted at the boundary surface, and partially reflected.

When mice still used a mechanical design ( with slotted ' chopper ' wheels interrupting a beam of light to measure rotation ), trackballs had the advantage of being in contact with the user's hand, which is generally cleaner than the desk or mousepad and does not drag lint into the chopper wheels.

When a crystal is mounted and exposed to an intense beam of X-rays, it scatters the X-rays into a pattern of spots or reflections that can be observed on a screen behind the crystal.

When an atom is probed by an external mechanism, such as a photon or a beam of electrons with energies in the range of 2 keV to 50 keV, a core state electron can be removed leaving behind a hole.

When it was done in an established place of execution, the vertical beam ( stipes ) could even be permanently embedded in the ground.

When a beam is measured with a laser beam profiler, the wings of the beam profile influence the D4σ value more than the center of the profile since the wings are weighted by the square of its distance, x < sup > 2 </ sup >, from the center of the beam.

When neutrons are scattered from hydrogen-containing materials, they produce diffraction patterns with high noise levels.

When neutron star core material is presumed to consist mostly of free neutrons, it is typically referred to as neutron-degenerate matter in scientific literature.

When an atom undergoes nuclear fission, a few neutrons ( the exact number depends on several factors ) are ejected from the reaction.

When the bomb detonated, the casing would contain the explosion long enough for mechanical shock to heat and compress the fusion fuel, and for fission neutrons to ignite nuclear fusion.

When fission neutrons break apart the lithium nuclei, some of the fragments are tritium nuclei, which participate in a very effective fusion reaction with the deuterium that is already present.

When adding nucleons ( protons or neutrons ) to a nucleus, there are certain points where the binding energy of the next nucleon is significantly less than the last one.

When the bomb explodes, the neutrons produced by the explosion would transmute the cobalt to the radioactive isotope cobalt-60 (< sup > 60 </ sup > Co ), which would be vaporized by the explosion.

When cosmic rays enter the atmosphere, they undergo various transformations, including the production of neutrons.

When a free neutron hits the nucleus of a fissile atom like uranium-235 ( < sup > 235 </ sup > U ), the uranium splits into two smaller atoms called fission fragments, plus more neutrons.

When purchased new a typical Cf-252 neutron sources emit between 1 × 10 < sup > 7 </ sup > to 1 × 10 < sup > 9 </ sup > neutrons per second but, with a half life of 2. 6 years, this neutron output rate drops to half of this original value in 2. 6 years.

When the nucleus of uranium-235 absorbs a neutron, it undergoes nuclear fission, splitting into two " fission products " and releasing energy and, on average, 2. 5 neutrons.

When a beam of neutrons emanating from a reactor is slowed down and selected properly by their speed, their wavelength lies near one angstrom ( 0. 1 nanometer ), the typical separation between atoms in a solid material.

When a nuclear reactor is operating its nuclear chain reaction generates many billions of free neutrons, and in the late 1940s NRX was the most intense neutron source in the world.

When irradiated with high-energy neutrons, Li-6 creates tritium, which mixes with the deuterium in the same mixture and fuses at a relatively low temperature.

When nuclei are hit with such energy, neutrons are released, which scatter and collide with other nuclei.

When cosmic rays hit the surface of Mars, neutrons and gamma-rays come out of the soil.

When a uranium-235 ( U-235 ) atom undergoes nuclear fission, it typically releases 2 or 3 neutrons ( with the average being about 2. 4 ).

The average number of neutrons that cause new fission events is called the effective neutron multiplication factor, usually denoted by the symbols k-effective, k-eff or k. When k-effective is equal to 1, the assembly is called critical, if k-effective is less than 1 the assembly is said to be subcritical, and if k-effective is greater than 1 the assembly is called supercritical.

When the reactors were being built, the British, unlike the Americans and the Soviets, had little experience with the behaviour of graphite when it is exposed to neutrons.

# When these energetic neutrons strike a fissile nucleus, a much larger number of secondary neutrons are released by the fission ( e. g. 4. 6 vs 2. 9 for Pu-239 ).

When this type of bomb explodes, the fission of the highly enriched uranium or plutonium core creates neutrons, some of which escape and strike atoms of lithium-6, creating tritium.

When these fast neutrons collide with hydrogen nuclei present in the soil being studied, they lose much of their energy.