Modern Physics Resource Packet (comments to: moloney@nextwork.rose-hulman.edu)

The light from object A in the sky has a peak wavelength of 35000 nm. The light from object B in the sky has a peak wavelength of 40000 nm. This tells us that


a) object A is brighter than object B
b) object A is dimmer than object B
c) object A is closer than object B
d) object A is farther away than object B
e) object A is hotter than object B
f) object A is colder than object B

What brand-new result came from Planck's analysis of blackbody radiation


a) E = frequency * wavelength
b) E = sqrt( (moc^2)^2+(pc)^2)
c) E = constant * frequency
d) E = mc^2
e) none of the above

What brand-new result came from Einstein's special theory of relativity
a) E = frequency * wavelength
b) E = sqrt( (moc^2)^2+(pc)^2)
c) E = constant * frequency
d) E = mc^2
e) none of the above
f) d) and b)

In deriving the equation for the compton wavelength shift

• there was a collision between a
  a) moving photon and stationary electron
  b) moving electron and stationary electron
  c) a moving electron and a stationary photon
  d) a moving photon and a stationary photon
  e) two moving electrons
  f) two moving photons

• what quantities were the same before and after the collision
  a) kinetic energy
  b) linear momentum
  c) relativistic energy
  d) kinetic energy and linear momentum
  e) relavistic energy and linear momentum
  f) none of the above
• what happens in a collision when theta =0?
• what happens in a collision when theta=180 degrees?

A beam of electrons strikes a crystal and the outgoing beam is very intense at angle theta.

A beam of photons also strikes the same crystal at the same incoming and outgoing angles, and the outgoing beam is intense at the same angle theta.

The electrons and photons must have the same initial
a) linear momentum
b) energy
c) wavelength
d) work function
e) energy and linear momentum
f) wavelength and linear momentum

Bohr

Atomic orbitals

Tunneling exercise from CUPS modern physics

Uncertainty exercise from CUPS modern physics

Relativity

Geiger tube counting and poisson statistics from CUPS Modern Physics

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