Question
Question: A progressive wave of frequency 500 Hz is travelling with a velocity of 360 m/s. How far apart are t...
A progressive wave of frequency 500 Hz is travelling with a velocity of 360 m/s. How far apart are two points 600 out of phase ?
A
1.2 cm
B
0.12 m
C
120 cm
D
12 m
Answer
0.12 m
Explanation
Solution
v = nl or 360 = 500l or l = 0.72 m
Now Df = (2p/l) Dx
or 60º = (360º/0.72) Dx
\ Dx = (0.72/6) = 0.12 m