Question

1. A speaker vibrates at 200 cycles per second.

Period:

Frequency:

2. A smoke alarm battery is beeping 2 times per minute.

Period:

Frequency:

Answer 1

1)

Period : $T=1/f=1/200=0.005\ s$

Frequency : $f=200 Hz$

2)

Period : $T=t/N=60/2=30\ s$

Frequency : $f=1/T=N/t=2/60=0.033 Hz$