Light of wavelength 500 nm falls normally on 50 slits that are 3.9 ✕ 10−3 mm wide and spaced 3.51 ✕ 10−2 mm apart. How many constructive interference fringes lie in the central peak of the diffraction pattern? (Round your answer to the nearest integer.)

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

Iwannasay c is the most accurate