1. The problem statement, all variables and given/known data In one of the classes, a recent experiment showing the interference of C60 molecules using a double slit apparatus was discussed. (a) If the average velocity of the C60 molecules is v= 200 m/s, calculate the De Broglie wavelength for a C60 molecule 2. Relevant equations lamda = h / p where p = mv 3. The attempt at a solution so m = 12 x 60 / 1000 to convert into kilograms. p = m x v = 144 lamda = 6.63 x 10^-34 J.s / 144 kg m/s= 4.604 x 10^-36 m Now that does not seem right because you can hardly see a wavelength that small. Is something wrong with what I have done. Thanks.