Warm-Up Exercise 36

Due 12:15 pm, Mon 19 Nov 2012

Physics 123, Fall 2012

Reading assignment: PpP 8.1-8.3, 10.1-10.4

Which of the following is NOT true of the 3D "wave vector"?
Its magnitude is equal to 2π/λ.
For every point inside a plane wave, it points the same direction.
For every point inside a spherical wave, it points the same direction.
It tells us which way the wave is going.
In 1D it reduces to the wave number k.