Show that when two progressive waves travelling in the same direction superimpose,the resultant was is also a progressive wave.

Deduce an equation for a progressive wave.

A progressive wave is represented by

State two properties of e.m wave.

Give two differences between stationary and progressive waves.

Work Problem related to speed, distance and time Places A and B are 70km apart on a highway. A car starts from A and another car start from B at the same time. If they travel in the same direction they meet in seven hours but if they travel towards each other meet in one hour. What are their speed.

Two monachromatic waves propagating in the same direction with amplitudes A and 3A respectively and differing in phase by pi /3 superpose. Calculate the amplitude of the resultant wave.

Show analytically how stationary wave are they formed due to superposition of two waves.