Question

pitch is how high or low a sound is.
true
false
question 2
sound is caused by vibrations in the air.
true
false

Explanation:

Question 1

In physics (a subfield of Natural Science), pitch is defined as the perceived highness or lowness of a sound, related to the frequency of the sound wave. So the statement "Pitch is how high or low a sound is" is correct.

Question 2

Sound is produced by vibrating objects, and these vibrations are transferred through a medium (like air) as sound waves. So the statement "Sound is caused by vibrations in the air" (more accurately, vibrations that propagate through air) is correct as sound requires a medium (air is a common medium) for propagation from the vibrating source.

Answer:

True