The total length of a sonometer wire between fixed ends is 110 cm. Tw...
Given data:
Total length of sonometer wire, l = 110 cm = 1.1 m
Ratio in which the wire is divided = 6 : 3 : 2
Tension in the wire, T = 400 N
Mass per unit length of the wire, μ = 0.01 kg/m
Calculation:
Let the length of the wire between the first and the second bridge be 6x.
Let the length of the wire between the second and the third bridge be 3x.
Let the length of the wire between the third bridge and the end be 2x.
Therefore, 6x + 3x + 2x = 1.1 m
11x = 1.1 m
x = 0.1 m
Length of first part of wire = 6x = 0.6 m
Length of second part of wire = 3x = 0.3 m
Length of third part of wire = 2x = 0.2 m
The fundamental frequency of a stretched string is given by the formula:
f = 1/2L √(T/μ)
where L is the length of the string, T is the tension in the string, and μ is the mass per unit length of the string.
For the first part of the wire, frequency (f1) = 1/2 (0.6) √(400/0.01) = 1200 Hz
For the second part of the wire, frequency (f2) = 1/2 (0.3) √(400/0.01) = 1707.11 Hz
For the third part of the wire, frequency (f3) = 1/2 (0.2) √(400/0.01) = 2000 Hz
The minimum common frequency with which all three parts can vibrate is the fundamental frequency of the shortest part, which is f2.
Therefore, the answer is option (B) 1000 Hz.
Summary:
- Length of wire between fixed ends = 1.1 m
- Ratio in which wire is divided = 6 : 3 : 2
- Tension in the wire = 400 N
- Mass per unit length of the wire = 0.01 kg/m
- Calculation involves finding the frequency of each part of the wire using the formula f = 1/2L √(T/μ)
- Minimum common frequency is the fundamental frequency of the shortest part of the wire, which is f2.
- The answer is option (B) 1000 Hz.
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.