Exam 9: Atomic Physics

The key process of a laser is

Light from an incandescent wire travels through a cool gas and is then dispersed into a(n)______________ spectrum.

With which object would the wave nature of matter be significant?

Removal of an electron from an atom leaves a

A beam of light can be thought of as consisting of a stream of particles called ______________.

Thomson discovered the ______________ in 1897.

Who developed the quantum theory in 1900 and has a constant named for him?

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.

The development of physics prior to 1900 is called

A quantum of electromagnetic radiation is called a(n)

When an electron goes from an excited state to the ground state,

When a hydrogen atom's electron goes from an energy state of n = 2 to n = 1,

If the energy of n = 6 is -0.378 eV and that of n = 5 is -0.544 eV in a hydrogen atom,a transition from n = 6 to n = 5 will _______________ a photon with an energy of approximately ______________.

Calculate the energy in electron volts of the photon emitted when an electron in a hydrogen atom goes from n = 2 to n = 1.

Heisenberg's uncertainty principle is most important for

Doubling the wavelength of a photon would ______________ its energy.

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

In the quantum model of the atom,the location of the electron is described in terms of ______________.

For a specific element,photons of how many different energies could be emitted by electrons in the n = 3 level as they return to the n = 1 level?