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What I Know Instruction: Write the letter of the correct answer on a separate sheet on 9 paper. 1. What is the force that makes oscillations damped? A. linear motion B. restoring force C. frictional force D. mechanical force 2. What will happen to the motion when friction reduces the mechanical energy of the system as time passes? The motion will become A. damped B. lineated C. randomed D. simpled 3. What do you call the oscillations of a system in the presence of some resistive force? A. linear oscillations C. random oscillations B. damped oscillations D. simple harmonic motion 4. What type of wave if the particles of the medium are vibrating to and fro in the same direction of energy transport? A. sound B. standing C. transverse D. longitudinal 5. What type of wave when the particles of a medium are vibrating at right angles to the direction of energy transport? A. sound B. standing C. transverse D. longitudinal 6. What will happen to the wavelength as a wave travels into a medium in which its speed increases? A. decrease C. remains the same B. increase D. it will increase and decrease after 7. What is transported when a sound wave travels from one place to another? A. air B. density C. energy D. wave 8. Which of the following is the speed of a wave traveling with a wavelength A, frequency f, and period T? A. v = = B. V = C. v = A.f D. v = f.T 9. What happens to the speed of the wave if its frequency doubles and the wavelength remains the same? It A. doubles C. is halved B. quadruples D. remains unchanged 10. A sound wave is a mechanical wave, not an electromagnetic wave. What does it mean? A. A sound wave transports its energy through a vacuum. B. A medium is required in order for sound waves to transport energy. C. The particles of the medium regularly and repeatedly oscillate about their rest position. D. The particles of the medium move perpendicular to the direction of energy transport. 1 1. If you strike a horizontal rod vertically from above, what can be said about the waves created in the rod? The particles A. vibrate horizontally along the direction of the rod B. travel along the rod from the point of impact to its end C. vibrate in circles, perpendicular to the direction of the rod D. vibrate vertically, perpendicular to the direction of the rod For numbers 12-14, refer to the problem below. A transverse wave is observed to be moving along a lengthy rope. Adjacent crests are positioned 2.4 m apart. Exactly six crests are observed to move past a given 3 point along the medium in 9.1 seconds. Determine the wavelength, frequency and speed of these waves. 12. What is the wavelength of the transverse wave? A. 2.1 m B. 2.2 m C. 2.3 m D. 2.4 m 13. What is the frequency of the wave? A. 0.56 Hz B. 0.66 Hz C. 0.76 Hz D. 0.86 Hz 14. What is the speed of the wave? A. 1.6 m/s B. 2.6 m/s C. 3.6 m/s D. 4.6 m/s 15. The frequency of a wave increases when the speed remains the same. What happens to the distance between two consecutive crests? It A. increases C. stays unchanged B. decreases D. increases first and then decreases
