Question

pls answer above question quickly
it's urjent

pls don't spam only for 5 points​

Answer 1

Answer:

1st answer :

The time period is the time per wave. So the time period T=4/20=0.2s

The frequency , f=1/T=1/0.2=5 Hz

2nd answer:

Frequency of vibration is defined as number of vibration per second ,

so , frequency , f=number of vibrations/time in second =7200/60=120Hz ,

(ii) Now given , v=360m/s and f=120Hz

by , v=fλ ,

or λ=v/f=360/120=3m

3rd answers:

We know that, frequency f=1/T

Thus, time period T=1/f=1/(5000)=0.0002 s