Question

Waves traveling along a string have a wavelength of 2.4m. When the waves reach the fixed end of the string, they are reflected to produce a standing wave pattern. How far from the end are the first 2 antinodes?

I feel like I don't have enough info here... I know that 1 wavelength consists of 2 antinodes but I'm not sure how that helps me get that number. Thanks :)

Answer 1

L/4 , 3L/4 .......... every 1/2 wavelength thereafter
so
.6 , 1.8 ... etc
http://en.wikipedia.org/wiki/Standing_wave

Answer 2

To make it easy for yourself think of a harp string half a wavelength long. In its lowest frequency it has nodes at the two ends which are fixed, half wavelength apart. Then the antinode is in the middle which is 1/4 wavelength from each end :)

Answer 3

Ok, I'm still a little bit confused. How do you know that it's half a wave length across?

& in that case I'm saying .5 wavelength=L? & .25wavelength=each antinode?

Thanks again :)