Abstract
The pioneer experiments of Lenard on the passage of cathode rays through matter led him to the well-known exponential law of absorptiom I/I
0
═ e
-λ
t
, (1) where I
0
is the incident, I the emergent, intensity of the beam,
t
the thickness of the absorbing material, and
λ
a constant depending upon the density of the material and the velocity of the rays. These experiments were followed up by Becker and Leithauser whose results agreed with the exponential relation, provided that I
0
was corrected for the reflected fraction of the beam. The values of
λ
obtained by these three observers are not, however, in even approximate agreement, and owing to the slow speed of the rays employed and to experimental difficulties, their results do not appear to provide sufficient evidence for the truth of equation (1).
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