I would believe that this is false.
His position x = V* t = 6.7*56= 375.2 m from point a
I would think something like fire or a torch because that seems like it means heat or maybe a campfire picture
Answer:
55.3
Explanation:
The computation of the number of bright-dark-bright fringe shifts observed is shown below:

where
d = 

n = 1.00028
Now placing these values to the above formula
So, the number of bright-dark-bright fringe shifts observed is

= 55.3
We simply applied the above formula so that the number of bright dark bright fringe shifts could come