Great experiments in physics by Unknown

Author:Unknown
Language: eng
Format: epub, mobi
Published: 2019-11-14T16:00:00+00:00

By destructive interference.

The mirror served to concentrate or focus the radiation.

Forming standing waves very similar to the case of sound.

Minima.

c = f λ, where f is the frequency λ the wavelength, and c the velocity, 3 x 1010 cm per sec in free space.

On wires the propagation speed depends upon the inductance and capacitance per unit length of wire.

I now constructed a second mirror, exactly similar to the first, and attached the rectilinear secondary conductor to it in such a way that the two wires of 50 cm length lay in the focal line, and the two wires connected to the spark gap passed directly through the wall of the mirror without touching it. The spark gap was thus situated directly behind the mirror, and the observer could adjust and examine it without obstructing the course of the waves. I expected to find that, on intercepting the ray with this apparatus, I should be able to observe it at even greater distances; and the event proved that I was not mistaken. In the rooms at my disposal I could now perceive the sparks from one end to the other. The greatest distance to which I was able, by availing myself of a doorway, to follow the ray was 16 meters; but according to the results of the reflection experiments (to be presently described), there can be no doubt that sparks could be obtained at any rate up to 20 meters in open spaces. For the remaining experiments such great distances are not necessary, and it is convenient that the sparking in the secondary conductor should not be too feeble; for most of the experiments a distance of 6–10 meters is most suitable. We shall not describe the simple phenomena which can be exhibited with the ray without difficulty. When the contrary is not expressly stated, it is to be assumed that the focal lines of both mirrors are vertical.

Thus the second mirror served to collect and focus more of the radiation upon the detector, in effect increasing its sensitivity.

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