ISSN:0002-9505    

DOI:10.1119/1.12130

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.12134

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP

摘要:

Gurney’s method of calculating speed imparted to driven metal by high explosives is described and applied to several geometrical configurations. The method permits derivation of a differential equation with a closed‐form solution describing the acceleration of the metal. Because of its versatility, Gurney’s approach continues to find new applications. This article serves as an appendix to a recent article on Gurney and, in addition, provides instructive applications of classical mechanics.

ISSN:0002-9505    

DOI:10.1119/1.12135

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP

摘要:

The resistive hose instability of a self‐pinched, relativistic electron beam in a collision‐dominated background plasma is investigated. Previously known results are recovered in a simple instructive way, without going through a lengthy mathematical derivation.

ISSN:0002-9505    

DOI:10.1119/1.12136

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP

摘要:

A compact solar camera built as a one semester student project is described. The overall length of the camera is 112 cm, and the effective focal length is 70 to 600 cm. The adjustable focal length means that an image of the sum with a diameter of 0.7 to 6.0 cm can be formed for viewing or recording. Lenses used in this camera were ’’borrowed’’ from a microscope and a photographic enlarger, and as such, there was no expenditure for constructing the camera.

ISSN:0002-9505    

DOI:10.1119/1.12137

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP

摘要:

A concrete model for teaching the concepts of reflection and refraction is described. This model is based on the use of wave strips which can be utilized by application of the principle of wave‐front continuity to demonstrate the concept of reflection and Snell’s law. A single and split field projection method is described for use in the classroom to demonstrate wave‐front matching at a boundary.

ISSN:0002-9505    

DOI:10.1119/1.12138

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP

摘要:

We describe an advanced undergraduate physics experiment which permits the measurement of ultrasound velocity and absorption in liquid systems at frequencies between 10 and 30 MHz and temperatures between 25° and 60 °C.

ISSN:0002-9505    

DOI:10.1119/1.12139

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP

摘要:

The dispersion relation for de Broglie waves is examined sufficiently to remove a possible ambiguity in the de Broglie frequency. The motion of a heavy (guided) photon, which obeys the same dispersion relation, is then studied in a gravitational field, leading to the Einsteinian relation frequency shift in a gravitational field.

ISSN:0002-9505    

DOI:10.1119/1.12140

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP

摘要:

For a bistable potential which is the sum of two hyperbolic cosine functions, the Schrödinger equation for the low‐lying states of a homonuclear diatomic molecule can be solved analytically. In this model the potential and the energy eigenvalues depend on three parameters, and the resulting wave functions are continuous and have continuous derivatives everywhere. This last property of the wave functions enables one to generate a family of soluble bistable potentials by applying the theorem of Darboux to the discrete eigenfunctions of the Schrödinger equation.

ISSN:0002-9505    

DOI:10.1119/1.12141

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP

摘要:

The expansion of the small oscillation motion of a damped system in terms of normal modes is given.

ISSN:0002-9505    

DOI:10.1119/1.12142

出版商:American Association of Physics Teachers    

年代:1980

数据来源: AIP