A collection of atoms has 20 of the sample in a state 5.9 eV ...

[cherise1989]

A collection of atoms has 20 of the sample in a state 5.9 eV above the ground state.
 
  If these emit coherent radiation, what is the wavelength of the laser light produced? (c = 3.00  108 m/s,
  h = 6.626  10-34 J  s, 1 eV = 1.60  10-19 J)
  A) 210 nm
  B) 91 nm
  C) 340 nm
  D) 34 nm

Question 2

The resistivity of gold is 2.44  10-8   m at room temperature. A gold wire that is 1.8 mm in diameter and 11 cm long carries a current of 170 mA. How much power is dissipated in the wire?
 
  A) 0.030 mW
  B) 0.0076 mW
  C) 0.013 mW
  D) 0.019 mW
  E) 0.025 mW

[al]

Answer to Question 1

A

Answer to Question 2

A

[cherise1989]

TY

[al]

You're welcome