False, the pitch of a sound wave is NOT its wavelength
The pitch of sound is akin to frequency. This can be defined as the time that is taken by a wave to complete one cycle (wavelength).
Explanation:
While frequency and wavelength of a wave are related, the relative pitch of the sound can change without changing the wavelength of the wave. An example of this phenomenon is when you hear a wailing ambulance approaching you. The pitch is high as it approaches you but the pitch lowers when it passes you and teh ambulance moves away from you. The wavelength of sound waves did not change but the compression and stretching of the sound wavelengths, respectively, caused the difference in the pitch of the sound.
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For more on sound pitch;
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So we want to know from which frequencies does ultrasound consist of. Sound, which human ear can hear is in the frequency range from 20 to 20000 Hz. Frequencies under 20 Hz are called infrasound and frequencies above 20000 Hz or 20 kHz are called ultrasound.
The direction in which the wave is moving.