# Particle Pulses Mental Model of the Mathematics of Waves

## Particle Pulses Mental Model of the Mathematics of Waves

- The following situation was given in pretests (N=68) and interviews (N=9)

## x=0

## x

## y

## Consider a pulse propagating in the +x-direction along a taut string. The string is lying on a table, and there is no friction between

## the string and the table. The diagram above shows the shape of the

## pulse at t = 0 sec. Suppose the displacement of the string at various

## values of x is given by the equation:

Pulse Shape: Correct Response