Question

What is the period of a wave if the wavelength is 100 meters and the speed is 50 m/s?

Answer 1

We know in one time period a wave travel distance =wavelengthso distance in two time period =34×2=68cm
                       Hence option  1 is correct,

Answer 2

We Know that Velocity=Wavelength*Frequency
therefore 50=100*frequency
50/100=frequency
0.5=frequency
Now,Time period=1/frequency
period=1/0.5
period=2seconds
2 second is your answer.