[单选题]
Two waves from individ/pi.i iob0 7fj q; u9opvx1chr6dt+ c.ual point sokcb5w(s:sy-b urces meet at a point $X$. Which of the following conditions is necessary for stable interference pattern to be observed at point $X$ ?
A. Waves of equal amplitude
B. Waves of equal wavelength
C. A constant phase difference between the waves
D. The waves must be electromagnetic
Post time 2024-1-26 22:03:40