### Problem 33 Chapter 1

Posted: **Sat Oct 13, 2018 7:14 pm**

by **almaochoa2D**

How do you know which equations to use for number 33? I started of my using E=hv and got a very small number so I decided to look in the solutions manual and it showed that I should be using the De Broglie equation. When do you know you should use that equation?

### Re: Problem 33 Chapter 1

Posted: **Sat Oct 13, 2018 9:13 pm**

by **zoepamonag4C**

I think it depends on what is given in the question. For this problem, the velocity is given, so we know that we are probably going to use an equation that relates to velocity. In this case, the DeBroglie works because it is (Lambda = h/p), where momentum, p, = mv. I don't think E = h*nu would work because the question give a value for E.