Question

If 20 waves of water pass you in 5.0 s and the waves are 2.0 m long, how fast are they moving?

1.0 m/s
2.0 m/s
4.0 m/s
8.0 m/s

Answer 1

2.0 m/s ?

Answer 2

\(v=λƒ\)
λ = 2.0 m
ƒ = 20 waves/5.0 seconds = 4.0 hz
hence 8 I believe

Answer 3

how did you know that it would be 8 with the 4.0 hz?

Answer 4

if i helps, this one was C (4.0)
If 20 waves of water pass you in 10.0 s and the waves are 2.0 m long, how fast are they moving?

1.0 m/s
2.0 m/s
4.0 m/s
8.0 m/s

Answer 5

\(\color{#0cbb34}{\text{Originally Posted by}}\) @jennylove
how did you know that it would be 8 with the 4.0 hz?
\(\color{#0cbb34}{\text{End of Quote}}\)
It is asking for velocity of the wave, so you must take the frequency, 4.0 hz, then multiply that with wavelength, 2 m

Answer 6

\(\color{#0cbb34}{\text{Originally Posted by}}\) @jennylove
if i helps, this one was C (4.0)
If 20 waves of water pass you in 10.0 s and the waves are 2.0 m long, how fast are they moving?

1.0 m/s
2.0 m/s
4.0 m/s
8.0 m/s
\(\color{#0cbb34}{\text{End of Quote}}\)
Yes it is 4.

Frequency is 20/10 = 2 hz, and wavelength = 2.0, so v=2*2=4

Answer 7

Oh okay, that makes sense. I was way off lol, thanks

Answer 8

I think you got 2.0 m/s using the other formula for velocity of a wave, v=\(\frac{λ}{T}\)