UNTRANSLATED .. 2.17

Stroboscope

Objective

Observation of a periodic phenomenon with a periodic flashed light.

Procedure

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Discussion

When the frequency of the phenomenon under observation and the frequency of the flashing light are matching, one can see a still image.

What happens when the frequency of the light is slightly increased, or slightly decreased?

What happens when the frequency of the flasing light is twice the frequency of the phenomenon? and when it is the half of its value?