If a particle and antiparticle are in the appropriate quantum states, then they can annihilate each other and produce other particles.

If denotes the quantum state of a particle ( n ) with momentum p, spin J whose component in the z-direction is σ, then one has

If the path of the particle or centre of mass of the rigid body passes through the given origin, its angular momentum is zero.

If we define r < sub > i </ sub > as the displacement of particle i from the center of mass, and v < sub > i </ sub > as the velocity of particle i with respect to the center of mass, then we have

If a particle of the beam crosses this surface, there will be some kind of interaction.

If we think of the atoms as impenetrable steel discs and the impinging particle as a bullet of negligible diameter, this ratio is the probability that the bullet will strike a steel disc, i. e., that the atomic projectile will be stopped by the foil.

If this acceleration is multiplied by the particle mass, the leading term is the centripetal force and the negative of the second term related to angular acceleration is sometimes called the Euler force.

If the depletion layer is large enough to catch the whole shower or to stop a heavy particle, a fairly accurate measurement of the particle ’ s energy can be made, simply by measuring the charge conducted and without the complexity of a magnetic spectrometer, etc.

If an elementary particle truly has no substructure, then it is one of the basic building blocks of the universe from which all other particles are made.

If the entire volume of the observable universe ( taken to be 3 × 10 < sup > 80 </ sup > m < sup > 3 </ sup >) were packed solid with fine dust particles about 1. 5 micrometres in size, then the number of different ways of ordering these particles ( that is, assigning the number 1 to one particle, then the number 2 to another particle, and so on until all particles are numbered ) would be approximately one googolplex.

If the particles are indistinguishable, this is impossible by definition ; either particle can be in either state.

If the particles are bosons, they occupy a totally symmetric state, which is symmetric under the exchange of any two particle labels:

If a particle of charge q moves with velocity v in the presence of an electric field E and a magnetic field B, then it will experience a force

If a force is applied to a particle for a time interval, the momentum of the particle changes by an amount

If the particle is moving at speed in the first frame of reference, in the second it is moving at speed

If a charged particle moves in an electromagnetic field, its kinematic momentum is not conserved.

If, e. g., u is the speed of a particle, then the straightforward notation for its velocity is u, < u > u </ u >, or.

If the photon energy is absorbed, some of the energy liberates the electron from the atom, and the rest contributes to the electron's kinetic energy as a free particle.

If the particle is in an eigenstate of position, then its momentum is completely unknown.

If the spin of a particle has a positive projection on its direction of motion then it is called left-handed ; otherwise, it is right-handed.

If Alice has a particle which is entangled with a particle owned by Bob, and Bob teleports it to Carol, then afterwards, Alice's particle is entangled with Carol's.

If a plan chooses to pay less than Medicare for some benefits, like skilled nursing facility care, the savings may be passed along to consumers by offering lower co-payments for doctor visits.

If a graph has an Eulerian circuit ( or an Eulerian path ), then an Eulerian circuit ( or path ) visits every edge, and so the solution is to choose any Eulerian circuit ( or path ).

If a potential predator visits, both parents respond aggressively, issuing alarm calls and striking with talons.

If there are no negative-weight cycles, then every shortest path visits each vertex at most once, so at step 3 no further improvements can be made.

He remembered they had a conversation about the city during Hotchner's first visits there: " If you are lucky enough to have lived in Paris as a young man, then wherever you go for the rest of your life, it stays with you, for Paris is a moveable feast.

If the Chief Executive is not able to discharge his or her duties for short periods ( such as during overseas visits ), the duties would be assumed by the Chief Secretary for Administration, the Financial Secretary or the Secretary for Justice, by rotation, in that order, as acting chief executive.

If you are considering enrolling at a centre or home-based service have some short visits with your child before officially starting and stay with your child to observe.

If the patient visits a county clinic, the percentage of the cost being covered falls to about 60 %.

If Sonic has over fifty rings, or supplies them with fifty rings or more with multiple visits, he is warped to a special stage.

If pilgrim visits had fallen, the discovery of King Arthur and Queen Guinevere's grave in the cemetery in 1191 provided fresh impetus for visiting Glastonbury.

If any nest contents were gone between consecutive visits, the nests were considered to have been depredated.

If they didn't, you can be sure I wouldn't get to come back for these visits.

If she visits the north part of town, she will either shop at a mall, a furniture store, or a jewelry store ( 3 ways ).

If she visits the south part of town then she will either shop at a clothing store or a shoe store ( 2 ways ).

If the player visits Calendar Man as Catwoman, he hints at Carmine being her father.

If physicians and other clinicians are able to reduce language barriers the resulting improved communication can improve compliance, reduce the number of emergency room visits, and enhance patient understanding.

: If a student visits a friend who is ill, it is a social activity,

If the player visits Calendar Man as Catwoman, he will bring up an incident involving both her and the Falcone family and will imply that Carmine Falcone might be Catwoman's father.

If Avenger visits him, the monk will teach a powerful new kick, " Kwon's Flail ," which proves a valuable attack against enemies inexperienced with the move.

If his body on earth dies, his soul, called the light, is condemned to stay forever in the realm it visits at that time.