Man's physical universe

xanabras

UNIT VI

ENERGY MAY BE PROPAGATED THROUGH THE

ETHER AND THROUGH MATTER BY MEANS

OF VIBRATIONS

INTRODUCTION TO UNIT VI

This unit is devoted to the study of electromagnetic waves, which

involve light and other vibrations ranging from cosmic rays to long

radio waves. It also takes up the study of vibrations in matter, which

constitute sound. In many respects, electromagnetic vibrations are

similar to vibrations in matter, and for that reason they are studied in

the same Unit. Both of these forms of energy differ so much from heat

and mechanical energy, studied in Unit V, that it seemed best to study

them in a separate Unit. Heat, of course, is a form of vibratory motion,

for it will be recalled that heat has been defined as the vibration of

The smaller units of matter which make up the molecules

molecules.

and atoms are likewise believed to vibrate; and, as we shall see, the

electron, the unit of electricity, is considered to be a mere wave packet.

It is quite proper, therefore, that the study of electricity in Unit VII

be preceded by this study of electromagnetic vibrations and of vibrations

in matter in the aggregate.

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