Quiz1_DB-key

# Quiz1_DB-key - CHMU 403 PhysChem 2 Quiz 1 KEY Name 1...

This preview shows pages 1–2. Sign up to view the full content.

Sept 18, 2008 Quiz 1 KEY Name………………………………………. . 1. Calculate frequency, wavenumber (in cm -1 ), energy (in J), and momentum for a photon with λ = 3 μ m (c = 3 10 8 m/s, h = 6.6 10 -34 Js) Frequency [Hz] ν = c/ λ = 3 10 8 / (3 10 -6 ) [m s -1 / m] = 10 14 Hz Wavenumber [cm -1 ] ν = 1/ λ = 1/(3 10 -4 ) [1/cm] = 3300 cm -1 Energy [J] E = h ν = 6.6 10 -34 10 14 [Js s -1 ] = 6.6 10 -20 J Momentum p = h/ λ = 6.6 10 -34 / 3 10 -6 [kg m 2 s -1 / m = kg m / s] = 2.2 10 -28 kg m / s 2. How did the observation of the line spectrum of the H atom help usher in the concepts of quantum mechanics? The hydrogen atom (line) spectrum demonstrated that the electrons in an atomic system can have discrete energy values only, whereas classical macroscopic systems can have arbitrary kinetic energy. Thus, a theoretical framework needed to be devised in which kinetic energy is quantized. 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

Quiz1_DB-key - CHMU 403 PhysChem 2 Quiz 1 KEY Name 1...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online