# What is the non-dispersive medium?

## What is the non-dispersive medium?

A medium in which speed of a wave is independent of frequency of wave is called a non-dispersive medium. For example, air is a non-dispersive medium for sound waves.

## When a group of wave travel through a non-dispersive medium the group velocity will be?

Question: In a non-dispersive medium, the wave speed (also known as phase velocity) v is independent of the wavelength ω . Show that in this medium, the group velocity vg=dωdk v g = d ω d k is equal to the phase velocity v=ωk v = ω k .

What is dispersive medium and a non-dispersive medium?

In a non-dispersive medium all of the different frequency components travel at the same speed so the wave function doesn’t change at all as it travels. But now the medium is dispersive so that different frequency components travel at different speeds. Now the wave changes shape.

### What is the relation between group velocity and phase velocity in a non-dispersive medium?

The velocity with which the phase of a wave travels is called phase velocity. The relation between group velocity and phase velocity are proportionate….Group Velocity and Phase Velocity relation for Dispersive wave non-dispersive wave.

Type of wave Condition Formula
Non-dispersive wave dVpdk=0 Vp=Vg

### Why is air a non dispersive medium?

Air doesn’t disperse light a lot, because the air is not very dense. However, as you’ve no doubt noticed, the sky is blue. That means that air does scatter light by a frequency-dependent amount. Basically, any scatterer has some frequency dependence so they’re all dispersive.

What is dispersive and non dispersive?

Non dispersive: waves of different frequency have the same. velocity (e.g. electromagnetic waves in vacuum) Dispersive: waves of different frequency have different. velocity (e.g. electromagnetic waves in medium; water.

## Why should a matter wave move with group velocity and not the phase velocity?

The phase velocity actually don’t carry any meaningful physical information for matter wave. All the meaningful information (like, momentum, velocity etc) contains in the group wave. So the velocity of the particle is determined by the group velocity, not phase velocity.

## Why air is non-dispersive medium?

Air doesn’t disperse light a lot, because the air is not very dense.

Why group velocity is less than phase velocity in dispersive medium?

Hence, the group velocity is less than the phase velocity Dispersion is when the distinct phase velocities of the components of the envelope cause the wave packet to “Spread out” over time.

### What is the relationship between phase and group velocity for a non relativistic free particle?

▶Relation between phase velocity and group velocity Thus for a non-relativistic free particle the group velocity (vg) is twice of the phase velocity (u).

### What do you mean by non dispersive?

Definition of nondispersive : not exhibiting, relating to, or causing dispersion : not dispersive a nondispersive lens nondispersive X-rays.

What is the group velocity in non-dispersive medium?

In non dispersive medium, the group velocity is identical to phase velocity. Here I am taking the example o vaccum. “Well, in vacuum the group velocity and phase velocity are identical.

## What is a non-dispersive medium?

A non-dispersive medium is that medium in which phase velocity and group velocity of a wave are same. Mathematically What are dispersive and non dispersive waves in terms of amplitude and velocity?

## What is the relation between group velocity and phase velocity?

The velocity with which the phase of a wave travels is called phase velocity. The relation between group velocity and phase velocity are proportionate. V g is the group velocity.

What is a dispersive medium according to Brillouin?

In his book Wave Propagation and Group Velocity (1960), Léon Brillouin defines a dispersive medium in the very first chapter as follows: He uses the symbol W ( k) for phase velocity, so he is saying that phase velocity that varies with frequency is indicative of a dispersive medium. Otherwise, the medium is non-dispersive.