Unit 5s Test Review Sheet Bhardwaj Unit 5s (Chapters 14 and 15) Vocabulary Terms Amplitude Pitch Longitudinal Wave Intensity Standing Wave Simple harmonic Motion Transverse Wave Principle of Superposition Reflected Wave Open Pipe Resonator Frequency Hooke’s Law Resonance Antinode Closed Pipe Resonator Law of Reflection Doppler Effect Trough Wavelength Node Refracted Wave Crest Loudness Decibel Incident Wave Unit 5s (Chapters 14 and 15) Concepts Compare simple harmonic motion from both pendulums and masses on springs Compare and contrast transverse, longitudinal, and surface waves Relate wave speed, wavelength, and frequency Identify amplitude, crest, trough, and wavelength of a wave Compare the speed of a wave in different mediums Compare constructive and destructive interference Compare and contrast sound waves with waves in general Compare the harmonics of string, open pie, and closed pipe instruments Unit 5s (Chapters 14 and 15) Practice Problems (A) Springs and Pendulums 1. What is the period of a 3 m long pendulum on Earth? (3.47 sec) 2. This pendulum takes 0.36 seconds to go from C to A. What is the length of this pendulum? (0.51 sec) 3. This pendulum is taken to planet X where its time period is 1.5 s. What is the gravity on that planet? (8.95 m/s/s) 4. A spring with a spring constant of 20 N/m is attached to a 1.5 kg mass and then set in motion. What is the period of the mass-spring system? (1.72 sec) 5. A mass on a spring that has been stretched 0.4 m has a restoring force of 40 N. What is the spring constant? (100 n/m) 6. A mass placed in simple harmonic motion on a spring with a spring constant of 25 N/m has a period of 1.99 sec. What size mass is on the spring? (2.5 Kg) Unit 5s Test Review Sheet Bhardwaj (B) Waves This wave train represents 1 second of time. 7. What is the frequency of this wave? (3.5 Hz) 8. What is the period of this wave? (0.286sec) 9. What is the speed of this wave if the wavelength (A) is 1.5 m? (C) Musical Instruments 10. Which harmonic is shown on the string at left? (?) 11. If this wave train is 90 cm long, what is the wavelength? (0.6 m) 12. If the speed of sound is 345 m/s what is the frequency of this wave? (575 Hz) 13. Which harmonic is shown in the pipe at left? (?) 14. If the length of the air column is 1.2 m long, what is the wavelength of this wave? (0.96 m) 15. If the speed of sound is 361 m/s what is the frequency of this wave? (376 Hz) 16. A car moving with a speed of 35 m/s sounds a 225 Hz horn. What frequency is heard by an observer standing on the sidewalk as the car approaches? (Vsound = 343 m/s) (251 Hz) 17. What frequency is heard by the observer as the car whizzes by and gets farther away? (204 Hz)
