The multiple reflection of a single sound wave is a/an
a. echo.
b. diffraction.
c. reverberation.
d. refraction

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

Two waves maximally constructively interfere at a point in space. among the options below, select the possible value of their phase difference at that point in space.a. zerob. πc. π/2d. not determinable by the information provided

What is the answer to these problems 30 pt