Distance = average speed ×time
Distance = 45 × 2
Distance = 90 miles
Answer:
How high the sound or how low the sound is depending on the pitch of the sound which in this case the frequencies of the sound. The higher of the frequencies , the higher of the pitch but it has the shortest length of wave (λ). That's why AM radio have a longer range but bad audio quality than FM radio that have better audio quality with shorter range.
It’s doesn’t change meaning it’s 0
