# examthreeanswers2009-2 - Physical Science 1 Exam Three Name...

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Name:________________________________________ Exam Three MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Each question is worth five (5) points. 1) Wave interference occurs for A) water waves. B) light waves. C) sound waves. D) all of these E) none of these Wave interference occurs for ALL waves regardless of type. The answer is D. 2) A floating leaf oscillates up and down two complete cycles in 1 s as a water wave passes by. The wave's wavelength is 10 m. What is the wave's speed? A) 10 m/s B) 40 m/s C) 2 m/s D) 20 m/s E) more than 40 m/s The frequency is 2 Hz. The wavelength is 10. The product gives the speed. The answer is D. 3) You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves A) stays the same. B) lengthens. C) shortens. The speed of the wave in water is constant, so if you increase the frequency, you decrease the wavelength since speed = frequency x wavelength. The answer is C. 4) If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a A) period of 1000 s. B) wavelength of 1000 km. C) frequency of 1000 Hz. D) speed of 1000 m/s. E) wavelength of 1000 m.

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examthreeanswers2009-2 - Physical Science 1 Exam Three Name...

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