The Superposition of Two Waves And , Results in a Wave with a Wavelength of
A)

Multiple Choice

The superposition of two waves, $$y _ { 1 } = \left( 2 \times 10 ^ { - 8 } \mathrm {~m} \right) \sin \left[ \pi \left( \frac { x } { 2 \mathrm {~m} } - \frac { 170 } { \mathrm {~s} } t \right) \right]$$ and $$y _ { 2 } = \left( 2 \times 10 ^ { - 8 } \mathrm {~m} \right) \sin \left[ \pi \left( \frac { x } { 2 \mathrm {~m} } - \frac { 170 } { \mathrm {~s} } t - \frac { 1 } { 2 } \right) \right]$$ , results in a wave with a wavelength of

A) $\frac { \pi } { 2 }$ m.
B) 2 m.
C) $\pi$ m.
D) 4 m.
E) 4 $\pi$ m.