Period and Frequency Calculations

A child on a swing completes 20.0 cycles in 25.0 s. Find the frequency.

• 0.800 Hz

• 0.800 s

• 1.25 Hz

• 1.25 s

A metronome clicks 80. times in 20. s. Find the period.

• 0.25 Hz

• 0.25 s

• 4.0 Hz

• 4.0 s

A stroboscope is flashing so that the time interval between flashes is 1/80.0 of a second. Find the frequency of the strobe.

• 0.0125 Hz

• 20.0 Hz

• 80.0 Hz

• 1.60 x 10² Hz

Calculate the frequency of a tuning fork that vibrates 24,000 times in 1.0 minute.

• 4.0 x 10² Hz

• 4.0 x 10² s

• 24,000 Hz

• 2.5 x 10^-3 Hz