## General Physics

### Problem 1

According to Bose-Einstein statistics, there exists a Bose condensate for collections of bosons. What does this mean?

### Solution 1

The Bose condensation phenomenon occurs for low temperatures T less than a critical temperature T_{C} where all particles reside in the lowest state.
For T < T_{C} (critical temp.), all particles reside in the ground state

### Problem 2

The lifetime for the 2p → 1s transition in hydrogen is 1.6E-9 s. How many hertz is the natural line width for the radiation emitted during the transition?

### Solution 2

### Problem 3

In the diamond structure of elemental carbon, the nearest neighbors of each C atom lie at the corners of a

- hexagon
- square
- octahedron
- tetrahedron
- cube

### Solution 3

D

### Problem 4

### Solution 4

Answer

### Problem 5

### Solution 5

Answer