Recent Papers

Conference on Magnetism

The conference adopted a resolution summarizing the results of work on the physics of magnetic phenomena carried out in the USSR in recent years; it noted the major successes achieved in the development of the science of magnetism, the creation of new instruments and apparatus, and the introduction …

SCATTERING AND ABSORPTION OF MICROWAVES IN ATMOSPHERIC FORMATIONS (RAIN, SNOW, CLOUD COVER, FOG) AND RADAR

Against Idealistic Distortions of the Concepts of Mass and Energy\*

An expanded text of a report delivered at a meeting of the Academic Council of the Sector of Dialectical Materialism of the Institute of Philosophy of the USSR Academy of Sciences on May 13, 1952.

Awarding of the Stalin Prizes in Physics for 1951

Nuclear Interaction of $\pi$-Mesons

“Great people,” wrote A. N. Tolstoy, “do not have two dates of their existence in history—birth and death—but only one date: their birth.” Such people include, first and foremost

Angular Distribution of $\pi$-Mesons Scattered by Hydrogen

STUDY OF INFRARED RADIATION OF THE NIGHT SKY\*

Report delivered at a meeting of the Division of Physical and Mathematical Sciences of the Academy of Sciences of the USSR in Moscow on March 19, 1952.

A NEW TYPE OF LUMINESCENCE IN GREEN PLANTS

REDUCTION OF X-RAY ABSORPTION BY A CRYSTAL UNDER INCIDENCE AT THE REFLECTION ANGLE

Candoluminescence

There are many different types of luminescence, among which photoluminescence, chemiluminescence, cathodoluminescence, radioluminescence, and others are now well known. The same cannot be said of candoluminescence, despite the fact that it has a long and still far from completed history. This articl…

Let us turn to the content of the book.

K.S. Shifrin. Light Scattering in a Turbid Medium.

MEASUREMENT OF THE VELOCITY OF $\gamma$-QUANTA IN AIR

New Books on Physics

A CASE OF NUCLEAR INTERACTION OF BOTH DECAY PRODUCTS OF A NEUTRAL MESON

From the Memoirs of Pyotr Nikolaevich Lebedev

WILSON DIFFUSION CLOUD CHAMBER WITH A HEATED BOTTOM AND COOLED LID

Variations in the Intensity of Cosmic Radiation Associated with Solar Activity

ON THE LAW OF THE INTERRELATION OF MASS AND ENERGY

This article attempts to expose the idealist distortions in the interpretation of the conclusions of modern physics connected with the law of the interrelation of mass and energy, quite incorrectly called the “law of equivalence of mass and energy,” and to criticize these distortions. A complete and…

ON PHILOSOPHY IN S. A. ARTSYBYSHEV’S TEXTBOOK

Memories of Pyotr Nikolaevich Lebedev

A CRITICAL REVIEW OF DATA ON THE TEMPERATURE OF THE IONOSPHERE

ON SOME HYDRODYNAMIC QUANTITIES FOR A MIXTURE

The note proposes one possible way of presenting the introduction of certain basic hydrodynamic quantities for a mixture, namely: mass density, mass flux density, and hydrodynamic velocity. The note pursues only didactic aims; the occasion for this discussion of the definition of the indicated hydro…

OPTICAL SPECTRUM OF AN EXCITON

Production of Negative Ions

PRESSURE, DENSITY, AND TEMPERATURE OF THE EARTH’S ATMOSPHERE AT ALTITUDES UP TO 160 km

INTERACTION OF $\pi$-MESONS WITH THE CARBON NUCLEUS\*

On Magnetohydrodynamic Waves in Gas

The Concept of Mass and Energy in Modern Physics

Determination of the Absolute Intensity of $\gamma$-Ray Beams

From the Editorial Board

MASSES OF LIGHT ATOMS CALCULATED FROM NUCLEAR REACTION ENERGIES

SOME QUESTIONS IN THE THEORY OF ELECTRICAL FLUCTUATIONS

Electrical fluctuations are known to be of great scientific and practical interest and at the same time cannot yet be considered comprehensively studied. It is therefore understandable that the theory of electrical fluctuations continues to attract attention, including with respect to such a fundame…

A major shortcoming of the book is its pronounced tendency toward a formally mathematical treatment of the problems.

S. Chandrasekhar. Radiation Transfer.

P. N. Lebedev, Selected Works. Edited and with a foreword by Prof. A. K. Timiryazev, “Classics of Natural Science” series, Gostekhizdat, Moscow–Leningrad, 1949, 242 pp., print run

QUENCHING OF FLUORESCENCE OF SOLUTIONS BY FOREIGN SUBSTANCES AS A METHOD FOR STUDYING THE KINETICS OF BIMOLECULAR REACTIONS IN SOLUTIONS

It seems highly expedient to provide a brief overview of the main provisions of the theory of fluorescence quenching by foreign substances and to reconsider the possibility of extending this theory to the kinetics of thermal bimolecular reactions.

ZONE PLATE

On the Existence of the Bineutron

P. N. LEBEDEV AND LIGHT PRESSURE

NUCLEAR PROCESSES AT HIGH ENERGIES *)

Part I presents a translation of E. Fermi’s article published in Progress of Theoretical Physics 5, No. 4 (1950), dedicated to the 15th anniversary of Yukawa’s theory; Part II is a translation of an article by the same author in Physical Review 81, 683 (1951).

Fission Neutron Spectrum of U$^{235}$

Ionization Gauges for Ultra-Low Pressures

RADIO ASTRONOMY*)

The Current State of the Theory of Superconductivity. II. Microscopic Theory

LIGHT WAVE AS THE BASIC MEASURE OF LENGTH

MASS AND ENERGY

A DEMONSTRATION EXPERIMENT ON THE ANNIHILATION OF A POSITRON–ELECTRON PAIR

Semiconductor Triodes Without Point Contacts

The main disadvantages of crystal triodes with point contacts are: a very high noise level, which made it impossible to use them as elements of amplifiers for radio reception, low useful power due to the negligible area of the “point” contact, and a maximum operating frequency limited to a few megac…

V. Elenbaas, *High-Pressure Mercury Discharge*.

EXPERIMENTAL PROOF OF THE EXISTENCE OF ELECTRIC CURRENTS IN THE IONOSPHERE