Two Harmonic Waves Are Described By $$y _ { 1 } = ( 7 \mathrm {~m} ) \sin \left( \frac { 5 } { m } x - \frac { 100 } { s } t \right)$$

Multiple Choice

Two harmonic waves are described by $$y _ { 1 } = ( 7 \mathrm {~m} ) \sin \left( \frac { 5 } { m } x - \frac { 100 } { s } t \right)$$ $$y _ { 2 } = ( 7 m ) \sin \left( \frac { 5 } { m } x - \frac { 100 } { s } t + 2 \right)$$ What is the phase (in rad) of the resultant wave when x = t = 0?

A) 3
B) 0
C) 2
D) 1
E) 4