Answer:
v = 3470 m/s
Explanation:
given data:
suppose n be the number of fringes shifted which is equal to 0.005
wavelength of light is given as 589 nm
difference light path is given as

but we know that


but in the question we have given that
l1=l2 = 11 m
therefore we have

solving for v, we get


v = 3470 m/s