Phase difference describes

the difference in the frequencies of two waves at time $t=0.$

the direction of motion of a wave at time $t=0.$

the difference in the phase angle of any two waves at the same point in time.

the shift between the positions of corresponding crests of two waves of the same frequency.

Categorize each of the following phase differences $$ according to the type of interference they produce.

$$ Completely destructive

Neither completely constructive

$\left[\begin{array}{c}?\end{array}\right]$ completely destructive

Answer Bank

$=270$

$=90$

$=300$

$=0$

$=180$