Bruce Rosenblum

Magnetic induction for the sensing of magnetic fields by animals—An analysis

Abstract Magnetic induction is analyzed as a possible mechanism for the detection of weak magnetic fields by animals. The range of parameters possible for a system which provides a signal greater than thermal noise and meets other constraints is determined. It is concluded that an organ millimeters in size is required to sense the Earths field by induction. The labyrinth of the inner ear is discussed in these terms.

The Observer in the Quantum Experiment

A goal of most interpretations of quantum mechanics is to avoid the apparent intrusion of the observer into the measurement process. Such intrusion is usually seen to arise because observation somehow selects a single actuality from among the many possibilities represented by the wavefunction. The issue is typically treated in terms of the mathematical formulation of the quantum theory. We attempt to address a different manifestation of the quantum measurement problem in a theory-neutral manner. With a version of the two-slit experiment, we demonstrate that an enigma arises directly from the results of experiments. Assuming that no observable physical phenomena exist beyond those predicted by the theory, we argue that no interpretation of the quantum theory can avoid a measurement problem involving the observer.

Bell's Theorem and Einstein's ‘Spooky Actions’ from a Simple Thought Experiment

In 1964 John Bell proved a theorem2 allowing the experimental test of whether what Einstein derided as “spooky actions at a distance” actually exist. We will see that they do. Bells theorem can be displayed with a simple, nonmathematical thought experiment suitable for a physics course at any level. And a simple, semi‐classical derivation of the quantum theory result can be given for physics students. These entanglement phenomena are today applied in industrial laboratories and are increasingly discussed in the popular literature. Unfortunately, they are also misappropriated by the purveyors of pseudoscience, something physicists have a responsibility to address.3 Students can be intrigued by the quantum strangeness physics has encountered at a boundary of our discipline.

The complex conductivity of the surface sheath of a type II superconductor at all magnetic fields

Abstract The complex microwave surface impedance of Pb 0.83 - In 0.17 was measured and a simple model was used to derive the sheath conductivity. The result, that even at fields considerably below H c2 this conductivity is very different from that at zero field, is unexpected.

Unexplained helium film effect with microwave dielectric resonators

Abstract An abrupt change in the microwave resonant frequency of a dielectric crystal when covered by a liquid helium film is observed to be orders of magnitude larger than expected. Characteristics of this unexplained phenomenon are outlined.

On advising would‐be physicists

The demographic and technological reasons for the recent job shortage for Ph.D. physicists are reviewed. These factors are considered as they apply to students now starting or considering a physics education. It is concluded that there is no valid economic reason for advising students against training for a career in Physics.