Waves (General) -- Review

Completion Complete each statement.

Testing Concepts

Fill in the blanks using the terms listed below. Some terms may not be used. Wave rarefaction reflection medium compression Refraction transverse wave amplitude diffraction compressional wave wavelength interference seismic wave frequency standing wave Crest Wave speed node Trough resonance

1. The number of ocean waves that pass a buoy in one second is the ______of the wave. 2. When the string of a violin is played with a bow, the violin vibrates in ______. 3. Waves bending because of a change in speed is called ______. 4. When you squeeze the coils of a spring together, you cause a ______. 5. The ______is the material through which a mechanical wave travels. 6. ______occurs when two waves combine to form a new wave. 7. The type of wave made by squeezing the coils of a spring and letting them go is a ______.

Select the word in parentheses that makes each statement correct.

8. When you shake a rope up and down, you create a (transverse, compressional, seismic) ______wave. 9. In a given medium, as the frequency of a wave increases, its speed (increases, decreases, remains the same) ______. 10. In a standing wave, the point at which the medium doesn’t move is called the (antinode, node, compression) ______.

Vocabulary Review Write the correct term in the space by each definition.

11. waves with wavelengths shorter than visible light that are used to kill bacteria ______12. highest energy electromagnetic radiation ______13. waves produced by an oscillating electric charge ______14. electromagnetic waves with the longest wavelengths ______15. waves with wavelengths between radio and visible light ______16. electromagnetic frequencies to which our eyes are sensitive ______17. waves used in medical imaging ______

Concept Review Select the term that best completes the sentence.

18. The ozone layer protects us from too much (ultraviolet, infrared, microwave) ______radiation. 19. Cell phones use (ultraviolet, infrared, radio) ______waves to transmit information. 20. Electromagnetic waves carry (force, energy, sound) ______. 21. FM radio wave frequencies are (higher than, lower than, the same as) ______AM waves. 22. When electric charges vibrate, they produce (photons, electromagnetic waves, radiant energy) ______. 23. Each color of visible light has a different (amplitude, intensity, wavelength) ______.

Short Answer

24. If you put a ringing alarm clock into a vacuum jar, you cannot hear the alarm. Explain. 25. Explain how seismic waves form.

Figure 11-1

26. In Figure 11-1, identify the following structures: ______wavelength ______crest ______amplitude 27. How is the amplitude of a compressional wave determined? 28. A standing wave shows both constructive and destructive interference. Explain. 29. As the frequency of an electromagnetic wave increases, how are the wavelength, amplitude, and speed affected? 30. How are changing electric and magnetic fields related? 31. Why does a cake bake in a microwave oven, but the baking dish does not get hot? 32. What are UVA and UVB, and how are they different? 33. What is the effect of tuning a radio to a particular station?

Problem 34. Speed can be determined by dividing the distance traveled by the time. The water waves in a lake travel 4.4 m in 2.0 s. What is the speed of the waves? 35. An ocean wave has a frequency of 2.0 Hz with a wavelength of 10 m. What is the velocity of the wave?