Stationary waves Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. Which describes the amplitude at a node of a stationary wave?
- A. Always zero
- B. Maximum
- C. Half the maximum
- D. Changing from zero to maximum each cycle
2. A string of length 0.40 m vibrates in its fundamental mode. What is the wavelength of the waves on it?
- A. 0.20 m
- B. 0.40 m
- C. 0.80 m
- D. 1.6 m
3. The tension in a string is increased by a factor of 9, with length and μ unchanged. By what factor does the fundamental frequency increase?
- A. 3
- B. 9
- C. 81
- D. 1.5
4. A string of mass per unit length 2.5 × 10⁻³ kg m⁻¹ is under a tension of 10 N. What is the speed of waves on it?
- A. 4.0 m s⁻¹
- B. 63 m s⁻¹
- C. 2.5 × 10⁻⁴ m s⁻¹
- D. 4.0 × 10³ m s⁻¹
5. A student wants to double the fundamental frequency of a string by changing only its length. What should she do?
- A. Double the length
- B. Quadruple the length
- C. Reduce the length to a quarter
- D. Halve the length