Exam 37: Early Quantum Theory and Models of the Atom

A particle is moving in a circular orbit about a fixed center of a two-dimensional harmonic oscillator. The ground-state (n = 1) energy is 1.0 eV. What is the energy of the second excited level (n = 3)?

A discrete spectrum is one that

As a result of Compton scattering, the scattered photon has

A gamma ray has an energy of 1 MeV. (a) What is the frequency associated with this photon? (b) What is the wavelength associated with this photon?

In hydrogen any transition ending in the ground state emits a photon that

Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.8 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?

Electrons come in discrete units of well defined mass and charge, but they also have wave properties.

A blackbody is a perfect emitter of the radiation it generates.

What is the energy of a 633 nm photon?

The part of an electron microscope that plays the same role as the lenses do in an optical microscope is

A light-emitting diode emits one microwatt of 640 nm photons. How many photons are emitted each second?

The radius of the n = 3 Bohr orbit in the hydrogen atom is

The energy of an ultraviolet photon is more than the energy of an infrared photon.

In the spectrum of white light which one of the following colors corresponds to the lowest temperature?

If the momentum of an electron is 1.95 × 10^-27 kg∙m/s, what is its de Broglie wavelength?

What is the magnitude of the energy difference between the lowest energy of a hydrogen atom (n = 1) and the second excited state (n = 3)?

A proton and an electron are both accelerated to the same final speed. If λ_p is the de Broglie wavelength of the proton and λ_e is the de Broglie wavelength of the electron, then

What wavelength corresponds to the n = 2 → n = 1 transition in singly-ionized helium?

Planck's constant

When a proton passes through matter, it is possible for it to interact with the matter in such a way that an electron and a positron are produced; this interaction is referred to as