When X-rays of wavelength 0.0630 nm are diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.8°. What is the distance (in pm) between the layers of atoms responsible for the diffraction?

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.

Kiloleter, mega leterhope this !

Ithink it is letter b, i may be wrong but i think that is the answer