 So what is the de Broglie wavelength in meters of a small car with the mass of 1,150 kilograms traveling at a speed of 55 miles per hour, which is conveniently they give you the conversion factor of 24.6 meters per second. So you're going to have to remember the de Broglie wavelength equation. Of course that's the wavelength equals Planck's constant times the mass or divided by the mass over times the velocity. Okay so remember Planck's constant, 6.626 times 10 to the negative 34 and they give you the mass is 1150 kilograms and the velocity would be 624. Okay oh and this is joules seconds sorry and remember we're going to have to remember that conversion from all of those units the joules. Okay well anyways let's just do that. Okay so 1 in Planck's constant 6.626 times 10 to the negative 34 joules seconds divided by 4.6 so if you want to think about this it's actually divided by divided so we can take this and say so I'd have to remember meters squared per second so one joule is 1 kilogram meters squared per second squared so we can plug in that for joules if we want to seconds divided by seconds hopefully you guys can see that that'll cancel that. So meters divided by meters that'll cancel that and then kilograms divided by kilograms and I don't care this is joules seconds it was joules seconds before sorry I forgot to put the seconds back in. If you guys want me to redo this problem I'd be more than happy to okay it's good for us to the real thing is I wanted to emphasize that unfortunately I forgot to put the seconds because it's joules seconds right so I forgot to put that low but I wanted to emphasize that cancelling out everything. Okay so we can get meters specifically at the time is everybody okay with that okay so I know it's a tiny bit confusing and if you want me to I'll be more than happy to do this. Okay so now all we have to do is plug each other 0.626 e negative 34 and you would expect okay so the wavelength of an electron is very large okay because an electron is very small so a car you would expect the wavelength to be very small because the car is very large okay. So hopefully you got a very small number like I did so I got 2.410 to the negative 38 and I can't remember did it tell us to do it in meters I think so here it was just selling meters. So again I can do another one of these I just forgot to put that per second our time seconds again okay so please don't let that any questions on this one.