Final answer:
The statement is false; the directionality of microphone pick-up is more related to its design than the frequency of sound waves.
Step-by-step explanation:
The statement that higher frequency sound waves are more directional and therefore the mic pick-up is more directional is false. Directionality of a microphone relates to its polar pattern and how it picks up sound from different directions, not directly to the frequency of the sound wave. While high-frequency sounds can be more easily directed or absorbed by certain materials, which might affect how a microphone picks them up, it is the design of the microphone that primarily determines its directionality.
The concept of frequency in sound relates to the pitch that we hear. A higher frequency sound wave corresponds to a higher pitch. This is separate from loudness, which is related to the wave's amplitude. Additionally, the Doppler effect describes the change in frequency or wavelength due to the relative motion of the source and observer, as seen when sound or light waves are emitted from a moving source and received by a stationary observer or vice versa.