摘要:

In a modern, generalized version of Young’s two‐slit experiment, it is shown that two separate pulsed lasers can generate visually observable, transient interference fringes of high contrast under the simple and obvious condition that the temporal and spectral structures of the interfering pulses overlap. In a second experiment, a picosecond streak camera allows the observation of spatio‐temporal interference fringes between two waves having different frequencies.

ISSN:0002-9505    

DOI:10.1119/1.17298

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP

摘要:

It is shown that the Schrödinger equation for the hydrogen atom in a semi‐infinite space limited by a conical boundary, with the nucleus at the vertex, has an exact solution in spherical coordinates. The limit in which the conical boundary becomes a tight sheath around its own axis corresponds to a ‘‘one‐dimensional’’ hydrogen atom with an infinitely degenerate ground state at the ionization threshold. This model of an atom in a semi‐infinite space includes as a special case the pioneering plane‐nodal‐wave‐function model used by Levine in 1965 to describe an isolated donor atom on the surface of a semiconductor.

ISSN:0002-9505    

DOI:10.1119/1.17299

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP

摘要:

The Debye shielding is derived in a simple way without assuming Boltzmann’s equilibrium. The conditions under which it applies and some of its consequences are discussed at the elementary level.

ISSN:0002-9505    

DOI:10.1119/1.17300

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP

摘要:

This paper presents a detailed analysis and a numerical solution of the familiar, yet often mistreated problem, of a chain sliding off a frictionless table top under its own weight.

ISSN:0002-9505    

DOI:10.1119/1.17442

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP

摘要:

The motion of a spring, initially suspended from its top end and hanging in equilibrium in the earth’s field, and then released and allowed to fall, is studied. The difference between the behaviors of loosely wound and tightly wound springs is emphasized.

ISSN:0002-9505    

DOI:10.1119/1.17301

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP

摘要:

The equilibrium positions of a partially submerged rod supported at one end are considered. Simple examples of bifurcations occur, and the breaking of these bifurcations by an ‘‘imperfection’’ is discussed.

ISSN:0002-9505    

DOI:10.1119/1.17302

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP

摘要:

A method of eliminating parameter bias in linear fits to log data (typically from exponential decay experiments) is extended to cases with arbitrary error statistics. This includes the common case of errors proportional to the square root of the value. Also it is observed that the elimination of the bias can be important for data sets with as few as 50 points.

ISSN:0002-9505    

DOI:10.1119/1.17303

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP

摘要:

The relation between degeneracy of classical frequencies in integrable systems and additional global constants of motion is investigated from a general point of view. It is shown that in autonomous systems withNdegrees of freedom the existence of Λ

ISSN:0002-9505    

DOI:10.1119/1.17304

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.17305

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP

摘要:

ISSN:0002-9505    

DOI:10.1119/1.17252

出版商:American Association of Physics Teachers    

年代:1993

数据来源: AIP