Question

Please help me tuition is tomorrow and I don't know the answer plz help 20th question .

Answer 1

75 times in a minute

1 minute = 60 seconds

75 times -------> 60 second

1 time -------> ((60/75) x 1) second

Time period = (60/75) second

Frequency = 1/Time period

Frequency = 1/(60/75) = 1/0.8 = 1.25 Hz

Hope it helped!