Exam 9: Chemical Reactions

Heisenberg's uncertainty principle states that it is impossible to know simultaneously which two properties of a particle?

A beam of laser light is

Discrete wavelengths of light are emitted by an excited gas because

When an electron in an atom moves from a lower energy level to a higher one, a ______________ is ______________.

When an electron in an atom is excited from a lower energy level to a higher one, a ______________ is ______________.

The development of physics prior to about 1900 is called ______________ physics.

The energy of a photon is ______________ proportional to its wavelength.

The de Broglie wavelength of a particle is inversely proportional to both its speed and its

Calculate the energy E_n (in eV) of a hydrogen atom's electron with n = 4.

Doubling the wavelength of a photon would ______________ its energy.