In physics, the common daily terms that we use synonymously have different technical meanings. This is defined so that we do not confuse between a common general term and a physical quantity. Physical quantities are defined as they are to give us a precise calculations or predictions regarding the outcome of an experiment or a physical system.

I like to share this Double Beta Decay with you all through my article.

## Distance vs Displacement

Suppose a particle is at A at time t_{1} and at B at time t_{2 }with respect to a given frame(see Figure-1)

During the time interval t_{1} to t_{2} the particle moves along the path ACB. The length of the path ACB is called the * distance *traveled during the time interval t

_{1}to t

_{2}. If we connect the initial position A with the final position B by a straight line, we get the

**of the particle. The magnitude of the displacement is the length of the straight line joining the initial and the final position. The displacement has both the**

*displacement***magnitude**as well as the

**direction**. Thus, displacement is a

**vector**quantity. In contrast the distance covered has only a magnitude and is thus, a

**scalar**quantity.

Having problem with Electromagnetic Spectrum Visible Light keep reading my upcoming posts, i will try to help you.

## Vector Addition of Distance and Displacement

Further the displacements add according to the triangle rule of **vector **addition. Suppose a particle kept on a table is displaced on the table and at the same time the table is also displaced in the room. The net displacement of the particle in the room is obtained by the **vector **sum of the two displacements. (see Figure – 2)

## Fly Fly Butterfly : An Example of difference between Distance and Displacement

Here we see a butterfly flying from **A to G** along the path **A-B-C-D-E-F-G**. The *Actual Path* of the flight is shown in **Black**, whereas the *Distance* and the *Displacement* are shown in **Red **and **Green** respectively(see Figure below)

So, we can easily see that while talking of *Distance*, we actually talk about the *Actual Path* traveled by the butterfly, whereas, while talking about *Displacement*, we consider only the starting and finishing points( here **A **&** G**). So, the *Displacement *is the length A-G with a direction from **A->G (A to G).**

From this, we can draw an important conclusion! If the butterfly flies through the path **A-B-C-D-E-F-G ** and then returns back to **A** through the same or different paths, effectively the* Displacement *of the butterfly will be **ZERO**!!! This is because, whatever be the path, the butterfly, after coming back to it’s initial position, will have no *net Displacement*; but it will have traveled a *Distance *which is equal to the length of the path it traversed. So, the *Distance *can be **HUGE**, but if after a time “*t*” it comes back to it’s original position, it’s *Displacement *will be **ZERO**!!!

So, we can say, **If anything starts moving, it has to travel a certain Distance, but it may not always have a Displacement!!!**

Understanding Electromagnetic Wave Equation is always challenging for me but thanks to all science help websites to help me out.