To measure small amplitudes of oscillations of a diaphragm making harmonic vibrations of high frequency ω, a "hammer" connected in an electrical circuit with a diaphragm and a telephone is used. The hammer of mass m is pressed against the diaphragm with a force that is adjusted by a micrometer screw. When the contact of the hammer with the diaphragm is interrupted, the current in the circuit is interrupted and a rattling can be heard in the telephone. Determine the amplitude of the vibrations if the rattling begins when the force with which the hammer presses the diaphragm reaches the value F.