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Two identical piano strings of length 0.750 m are each, tuned exactly to 500 H z . The tension in one of the strings is then increased by 21 % . If they are now struck, what is the beat frequency between the fundamental mode of the two strings?

Options

  1. A45
  2. B50
  3. C60
  4. D40

Correct answer

B. 50

Step-by-step solution

f 1 = 1 2 l T μ = 500 f 2 = 1 2 l 1.21 T μ = 1.1 500 f 2 - f 1 = 50

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