Question

How to Calculate the de Broglie wavelength for each of the following ? a. an electron with a velocity 10.% of the speed of light b. a tennis ball (55 g) served at 35 m/s (,80 mi/h)

Answer 1

h = planks constant 
m = mass of the object 
u = velocity of the object 

h = 6.626 * 10^-34 J/s 
the mass of an electron is 9.12*10^-31 kg 
10% speed of light = 10% * 3*10^8 = 3*10^7 m/s, i dont have my graphing calc with me right now so i leave the technicalities up to you