Sunday, February 13, 2011

Mastering Physics: ± Absorption and Emission in the Hydrogen Atom

A monochromatic laser is exciting hydrogen atoms from the n = 2 state to the n = 5 state.

Part A
What is the wavelength lambda of the laser?
Express your answer to three significant digits in nanometers.
ANSWER:

  lambda  = 435
  {\rm nm}

Part B
Eventually, all of the excited hydrogen atoms will emit photons until they fall back to the ground state. How many different wavelengths can be observed in this process?
ANSWER:


10

Part C
What is the longest wavelength lambda_max that is observed?
Express your answer to three significant digits in nanometers.
ANSWER:

  lambda_max  = 4059
  {\rm nm}

Part D
What is the shortest wavelength lambda_min observed?
Express your answer to three significant digits in nanometers.
ANSWER:

  lambda_min  = 95.1
  {\rm nm}

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