Which one of the following scenarios accurately describes a condition in which resonance can occur?
a.) vibrating tuning fork is struck and begins to vibrate as the object used to strike it is placed away from the tuning fork.
b. ) a pipe's length is equal to 1⁄2 of the wavelength of the sound waves produced by a tuning fork vibrating over one end of the pipe that's open to the air at both ends.
c.) a person is holding a tuning fork on one end of a football field and another person is holding a separate tuning fork on the opposite end of the field.
d.) a column of air has a height equal to 1⁄8 of the wavelength of the sound waves produced by a tuning fork vibrating over the column of air in an open pipe that's partially immersed in water.