Page 1 of 5 CTWaves-1. Is "The Wave" at the stadium a transverse wave or a longitudinal wave? A) Transverse B) Longitudinal C) neither Answer: Transverse CTWaves-2. A wave on a stretched drum head is an example of a A) Transverse wave B) Longitudinal wave C) it's not a wave at all Answer: Transverse CTWaves-3. The graph below shows a snapshot of a wave on a string which is traveling to the right. There is a bit of paint on the string at point P. y x P vwave At the instant shown, the velocity of paint point P has which direction? Answer: downward A B D C E) None of these At the instant shown, the acceleration of the particle has which direction? (Same choices) Answer: downward Phys1120 Concept Tests, M.Dubson ©University of Colorado at BoulderPage 2 of 5 CTWaves-4. Three waves are traveling along identical strings (same mass per length, same tension, same everything). Wave B has twice the amplitude of the other two. Wave C has 1/2 the wavelength than A or B. Which Wave goes slowest? A B C D) All have same v Answer: All have same v. In general, the speed of a wave depends on the properties of the medium. y x vwave y x y x A C B Which wave has the highest frequency? A B C D) All 3 have the same frequency Answer: C Phys1120 Concept Tests, M.Dubson ©University of Colorado at BoulderPage 3 of 5 CTWaves-5. Consider the equation x – v t = θ, where v and θ are constants. The variable x is position and t is the time. A point x that obeys this equation is a point that A) increases (moves to the right) with speed v B) decreases (moves to the left) with speed v C) is constant x (not moving) D) increases (moves to the right) with speed θ E) decreases (moves to the left) with speed θ Answer: increases (moves to the right) with speed v CTWaves-6. Two traveling waves 1 and 2 are described by the equations. yxt x tyxt x t122242(,) sin( )(,) sin( )=−=− All the numbers are in the appropriate SI (mks) units. Which wave has the higher speed? A) 1 B) 2 C) Both have the same speed. The wavelength λ of wave 1 is most nearly A) 1m B) 2m C) 3m D) 4m The period of wave 2 is most nearly A) 1s B) 2 s C) 3 s D) 4 s Answers: Wave 2 has the higher speed. The wavelength of wave 1 is about 3 m (π m, to be exact). The period of wave 2 is about 3 s . Phys1120 Concept Tests, M.Dubson ©University of Colorado at BoulderPage 4 of 5 CTWaves-7. Two impulse waves are approaching each other, as shown. Which picture correctly shows the total wave when the two waves are passing through each other? A) B) C) D) Answer: D Phys1120 Concept Tests, M.Dubson ©University of Colorado at BoulderPage 5 of 5 CTWaves-8. When you turn up the volume on your sound system, .. A) the speaker cone oscillates back and forth more rapidly, completing more cycles per second B) the speaker cone oscillates back and forth more slowly, completing fewer cycles per second C) the speaker cones oscillates back and forth a farther distance in each cycle D) the speaker cones oscillates back and forth a shorter distance in each cycle E) None of these Answer: C CTWaves-9. Three pressure waves in air (sound waves) , all with the mathematical form xty(x,t) Asin 2T⎡⎤⎛⎞=π−⎜⎢λ⎝⎣⎦⎟⎥⎠, are labeled A, B, and C. Which sound is the loudest and which is the highest pitch? Answer: B is loudest (highest amplitude) and C is highest pitch (highest frequency, shortest wavelength). BAyxyxCyPhys1120 Concept Tests, M.Dubson ©University of Colorado at Boulder
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