Sound waves travel their a. outward from; source b. outward from; pressure c. inward toward; source d. inward toward; pressure

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

What are atoms of the same element with varying number of neutrons

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?