Question

A wave with a frequency of 0.5 Hz and a speed of 10 m/s has a wavelength of a. 50 m. c. 20 m. b. 0.5 m. d. 0.2 m.

Answer 1

We know, wavelength = speed / frequency 
w = 10 / 0.5
w = 20 m

In short, Your Answer would be Option C) 20 m

Hope this helps!