Arrange the following particles in increasing order of values of e/m ratio : electron (e), proton (p), neutron (n) and α-particle (α)−n,p,e,αn,α,p,en,p,α,ee,p,n,α

The e/m ratio, or charge-to-mass ratio, is a physical quantity that is characteristic of a particle. It is defined as the charge of the particle divided by its mass.

1. Neutron (n): The neutron is a neutral particle, meaning it has no charge. Therefore, its e/m ratio is 0.

2. Proton (p): The proton has a positive charge and a mass of about 1 atomic mass unit (amu). Therefore, its e/m ratio is 1.

3. Alpha particle (α): An alpha particle is a helium nucleus, consisting of 2 protons and 2 neutrons. It has a charge of +2 and a mass of about 4 amu. Therefore, its e/m ratio is 0.5.

4. Electron (e): The electron has a negative charge and a very small mass (about 1/1836 amu). Therefore, its e/m ratio is very large in magnitude (but negative).

So, in increasing order of e/m ratio, the particles are: neutron, alpha particle, proton, electron.