The diagram shows part of a stationary wave on a string.
X and Y are points on the string. The vibrations at X and Y are ${180^ \circ }$ out of phase.
What is the distance between X and Y?

1 )
one-quarter of a wavelength
half a wavelength
3 )
one wavelength
4 )
two wavelengths
تحلیل ویدئویی تست
منتظریم اولین نفر تحلیلش کنه!