Consider the Bohr model for the hydrogen atom. (c = 3.00 108 ...

[futuristic]

Consider the Bohr model for the hydrogen atom. (c = 3.00  108 m/s, 1 eV = 1.60  10-19 J, h = 6.
 
  626  10-34 J  s)
  (a) How much energy (in eV) is needed to cause a transition of an electron from the second excited state to the third excited state?
  (b) What wavelength photon just has enough energy to initiate the transition in (a)?

Question 2

A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field. The magnitude of the torque acting on this loop when the plane of the loop makes a 30 angle with the field is measured to be 1.1 N  m.
 
  What is the area of this loop?
  A) 0.80 m2 B) 0.53 m2 C) 0.40 m2 D) 0.20 m2 E) 0.26 m2

[Liddy]

Answer to Question 1

(a) 0.661 eV (b) 1.88 m

Answer to Question 2

B

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[Liddy]

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