The Bohr radius of the hydrogen atom is 0.529 10-10 m. The ...

[KimWrice]

The Bohr radius of the hydrogen atom is 0.529  10-10 m. The radius of the n = 2 state is
 
  A)
 
  1.06  10-10 m.
  B)
 
  2.12  10-10 m.
  C)
 
  0.265  10-10 m.
  D)
 
  0.529  10-10 m.
  E)
 
  2.65  10-10 m.

Question 2

A 30.0-kg child sits on one end of a long uniform beam with a mass 20.0 kg and a 40.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance 1.10 m from the 30.0-kg child. How long is the beam?
 
  A)
 
  2.12 m
 
  B)
 
  1.98 m
 
  C)
 
  1.93 m
 
  D)
 
  2.07 m
 
  E)
 
  2.20 m

[samiel-sayed]

Answer to Question 1

B

Answer to Question 2

B