Ques. No. 158. A tuning fork of frequency 340 Hz is vibrated just above the tube of 120 cm height. Water is poured slowly in the tube. What is the minimum height of water necessary for the resonance? The speed of sound in air = 720 m s-1.
(A) 25 cm
(B) 30 cm
(C) 40 cm
(D) 45 cm
Answers
Answered by
5
Answer:
D) 45cm
Explanation:
Frequency of fork = 340hz
Height of Tube = 120cm
Thus,
L1=v/4F
l=340/4*340
= 1/4
=2.5 m or 25 cm
L2 = 3V/4F
L = 3/4
L = 7.5m or 75cm
L3 = 5V/4F
L = 5/4
L = 1.25 m or 125cm
Therefore resonance = 1.20-0.75
= 0.45 m or 45cm
Answered by
2
Answer:
Explanation:Frequency of fork = 340hz
Height of Tube = 120cm
Thus,
L1=v/4F
l=340/4*340
= 1/4
=2.5 m or 25 cm
L2 = 3V/4F
L = 3/4
L = 7.5m or 75cm
L3 = 5V/4F
L = 5/4
L = 1.25 m or 125cm
Therefore resonance = 1.20-0.75
= 0.45 m or 45cm
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