What is the period of a wave if the wavelength is 100 m and the speed is 200 m/s?

(a) 200,000 s

(b) 2 s

(c) 0.5 s

(d) 100 s

explain how to get the answer, so that i may do the rest of the problems and understand how to do it! you in advance : )

This is simple question and easy to understand.
so first you use a formula to calculate frequency of the wave.
v _ stands for velocity a.k.a speed
f_ stands for frequency which you have to find.
(pronounced lemda)_ stands for wavelength.
Then you gonna place all your values according to you have in the formula as shown then solve for f.
Finally, you use the time formula
where
T_ is period a.k.a time which equal to the reciprocal of frequency or equal to 1/f.
Simply input your values according to the formula and you your answer as 0.5s