Superposition and stationary waves Quiz
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5 questions, one answer each
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1. Two pulses each of displacement +0.020 m overlap exactly. What is the resultant displacement?
- A. 0.020 m
- B. 0.040 m
- C. 0.028 m
- D. zero
2. A stationary wave on a string fixed at both ends is in its first harmonic. The string is 0.80 m long. What is the wavelength?
- A. 0.40 m
- B. 0.80 m
- C. 1.6 m
- D. 3.2 m
3. The tension in a string is halved with the length and mass per unit length unchanged. By what factor does the first harmonic frequency change?
- A. ×0.5
- B. ×0.71
- C. ×0.25
- D. ×1.4
4. Which statement about a stationary wave is correct?
- A. Points either side of a node oscillate in phase
- B. Energy is transferred along the wave
- C. All points have the same amplitude
- D. All points between adjacent nodes oscillate in phase
5. Microwave minima are found 1.4 cm apart. What is the wavelength?
- A. 0.70 cm
- B. 1.4 cm
- C. 2.8 cm
- D. 5.6 cm