The RATE of change of position is speed.
What assignment, you have to work with me here i don't know what were working on
Okay so yeah u have to minus then subtract then decide it it’s a method i was taught to do
Answer:
240 m
120 m
Explanation:
d = Path difference = 120 m
For destructive interference
Path difference

The longest wavelength is 240 m
For constructive interference

The longest wavelength is 120 m