Physics

Problem

Two progressive waves of the same frequency travel in the same direction through air. Their amplitudes are

3.0\,\text{cm}

and

4.0\,\text{cm}

respectively. At a certain point, the amplitude of the resultant wave is observed to be

5.0\,\text{cm}

. The phase difference between the two waves at this point is closest to a)

120^{\circ}

90^{\circ}

60^{\circ}

150^{\circ}