PURPOSE: To demonstrate the change in frequency of a tuning fork at liquid nitrogen temperature.

DESCRIPTION: Cool down one of the two identical tuning forks in liquid nitrogen. When it is cooled, beats are observed between identical tuning forks, one of which has been cooled.

SUGGESTIONS:

REFERENCES: (PIRA unknown.)

EQUIPMENT: Two identical tuning forks with hammer, liquid nitrogen.

SETUP TIME: 5 min.