At what speed must a neutron travel to have a wavelength of 9.2 pm?

Answer 1

wavelength = h/mv
h = Planck's constant
m = mass in kg
v is velocity in m/s

Answer 2

So the solution to the problem is v= wavelength x h/m?

Answer 3

nope

Answer 4

is it V=h/m x wavelength

Answer 5

yes.

Answer 6

I put into my calculator (6.626e-34)/(9.109e-31)(0.92e-11)= 6.69e-15 m/s but it is wrong, so what did I mess up?