Wave crests passing a point in 0.50s: finding wavelength, frequency and velocity

[404]

A series of wave crests, all of which will pass a point in 0.50s, find wavelength (cm), frequency, and velocity

The answers are 3.8cm, 6.0 Hz and 23 cm/s...

Can someone explain how to get those answers? I did arrive at an answer, but they weren't right :(.

 

[chroot]

The statement "A series of wave crests, all of which will pass a point in 0.50s, find wavelength (cm), frequency, and velocity" does not contain enough information to answer the question. Please make sure you copied the question exactly as it was given to you.

- Warren

 

[404]

That is what the question said... I did omit the diagram, but it's just a simple and plain wave with a line through it, no measurements, no info of any kind.