Modern Physics Lecture 6

The Compton effect proved that ____.

• electrons are waves

• photons are praticles

• massless particles move at the speed of light

The inverse photoelectric effect happens when ____.

• a material absorbs an electron and emits electromagnetic radiation

• a material absorbs electromagnetic radiation and emits an electron

• alpha particles are scattered on a metal film

Which is true about Rutherford scattering?

• It can be observed when alpha particles are scattered on a metal film.

• It relies on relativistic mechanics.

• It can be explained by assuming that the positive charge in the atom is evenly distributed.

• The amount of back-scattering is higher than it was previously expected.

Bohr's atom model explains the discrete lines in atomic spectra.

• True

• False

The De Broglie wavelength of a particle is ____.

• proportional to its energy

• proportional to its momentum

• inversely proportional to its momentum

• only defined for photons