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Neutrino is a small, tiny elementary particle which carries no electrical charge which means it is not affected by electro-magnetic forces, and travels almost the speed of light and passes through ordinary matter without making any interaction.

A Pascal law states that when you apply force at one point on liquid it will transmit equal force from one location to another within the liquid.

A discrete bundle of electromagnetic light or energy, which always remains in motion is referred as photon.

Dark matter is an invisible matter in the space that can hold the stars into the galaxy.  They have no effect of electromagnetic force on it, which means it does absorb, reflect or emit light that makes them practically invisible.

Uncertainty principle tells that the momentum and position of a particle cannot be measured precisely.

Quantum tunnelling is the process where the particle passes through an obstruction or barrier to reach at another end.  It is referred as tunnelling as the particle as “dug” out the way through the potential barrier.

When matter and light exhibits properties of both waves and particles, it is referred as Wave-Particle duality.  For instance, Light can behave like wave when it shines through narrow slits while, when exposed to some metal surface it will spray electrons acting as a particle. So under different conditions it will act.

Dyne is a unit of force or also referred as C-G-S (centimetre – gram –-second).  It means that when a force is applied to mass of 1 gram, it gives acceleration of 1 centimetre per second.

Nephelometer is the instrument used to measure the scattering of light by particles suspended in a liquid