The wavelength of the emitted photon when a hydrogen atom makes a ...

[Sufayan.ah]

The wavelength of the emitted photon when a hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0  108 m/s, h = 6.626  10-34 J  s, 1 eV = 1.60  10-19 J)
 
  A) 122 nm
  B) 203 nm
  C) 243 nm
  D) 389 nm
  E) 411 nm

Question 2

A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/40 = 8.99  109 N  m2/C2)
 
  A) 25 C
  B) 1.0 C
  C) 10 nC
  D) 0.025 C
  E) 25 nC

[Hdosisshsbshs]

Answer to Question 1

A

Answer to Question 2

E