If a wave complete 20 vibration in 2.5s, then its frequency is_________
A. 200 Hz
B. 50 Hz
C. 20 Hz
D. 8 Hz
Answer:D
If a wave complete 20 vibration in 2.5s, then its frequency is_________
A. 200 Hz B. 50 Hz C. 20 Hz D. 8 Hz