Exam 9: Atomic Physics

The energy differences in some of the rotational energy levels of the water molecule allow cooking with ______________.

The "X" in X-ray stands for ______________.

When many of the atoms or molecules in a sample have been excited into a metastable state, a(n) ______________ has occurred.

Doubling the wavelength of a photon would ______________.

Who, in 1925, postulated that matter, as well as light, has properties of both waves and particles?

Aristotle's "continuous" model of matter was proved wrong about 1807 by

Niels Bohr postulated that the hydrogen electron radiates energy only when it makes a(n) ______________ from one allowed orbit to another.

The ancient Greek who is known for championing the concept of atom was named ______________.

The transitions of an electron in the hydrogen atom to the n = 3 level result in the

In terms of energy levels of electrons, a potential well has

When an electron is added to an atom, a(n) ______________ ion is formed.

How much energy must be absorbed to ionize a hydrogen atom whose electron is in the ground state (n = 1)?

Matter waves were confirmed when it was found that electrons

Dispersing light from a gas-discharge tube produces what type of spectrum?

The energy levels of electrons in atoms are ______________, which means that only certain values of energy are allowed.

In common physics terminology, a particle with a negative potential energy is in a(n) potential ______________.

The development of physics since about 1900 is called

If the energy of n = 4 is -0.85 eV and that of n = 2 is -3.40 eV in a hydrogen atom, a transition from n = 4 to n = 2 will release a photon of what energy?

When a hydrogen electron is in its first excited state, its principal quantum number is

The dilemma known as the ultraviolet catastrophe was resolved in 1900 by