A pipe closed at one end is 1.0m long. The air in the pipe is set into vibration and a fundamental note of frequency 85Hz is produced. Calculate the velocity of sound in the air. (Neglect end correction).
-
A.
340.0ms-1 -
B.
33Oms-1 -
C.
170ms-1 -
D.
85.0ms-1 -
E.
42.5ms-1
Correct Answer: Option A
Explanation
L = λ/4; λ= 4 = 4m
v = fλ = 85 x 4 = 340ms-1