NEET Physics Standing Waves MCQ Question
A string of length 1.2 m is fixed at both ends and vibrates in its fundamental mode. If the mass of the string is 3.5 × 10⁻² kg and the frequency of vibration is 45 Hz, what is the tension in the string?
45.6 N
32.4 N
25.8 N
12.5 N
Correct Answer
Detailed Explanation
For a string fixed at both ends and vibrating in its fundamental mode, the wavelength is twice the length of the string. Using the formula for speed v = fλ and v² = T/μ, where μ is mass per unit length, we calculate the tension T in the string.
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