Answer: Option D:<u> He should decrease the frequency. </u>
Pitch is a perceptual property of sound. It can be perceived in the sense of high or low musical melodies. The pitch and frequency are related. when frequency increases, pitch increases. And when frequency decrease, pitch decreases.
Hence, the correct option is D: he should decrease the frequency.
Definition: Frequency is the measurement of the number of times that a repeated event occurs per unit of time. Sound moves through a medium such as air or water as waves. It is measured in terms of frequency and amplitude. Frequency, sometimes referred to as pitch, is the number of times per second that a sound pressure wave repeats itself.
Acceleration is how much the velocity changes within a period of time so,
Acceleration= is the change in velocity divided by change in time
your units will be m/s squared
Answer:
A theory or hypothesis does not necessarily provide an accurate scientific explanation to any topic but predicts what can happen.
Explanation:
continents, paleoclimate indicators, truncated geologic features, and fossils:D