Please asnwer all the questions on the picture, just directly answer (without ex
ID: 1437182 • Letter: P
Question
Please asnwer all the questions on the picture, just directly answer (without explanation)is ok
Multiple choice (75 points, 1.5 points each) Record answers on the scantorn sheet. Use #2 pencil. Some questions, suitably noted, may have more than one answer, and all correct answers are required for credit. Otherwise, assume each question has only one correct answer. 1. A wiggle (or oscillating disturbance) in time is a a. vibration. b. wave. c. both a wave and a vibration d. neither a wave nor a vibration 2. In comparison to the velocity of the source of a wave, the velocity of the wave is a. always the same b. always slower c. always faster e. none of these 3. Compared to the frequency emitted by the source of the wave, if the source and observe are moving closer together, the observed frequency of a wave is a. the same c. greater b. less d. not enough information to tell 5. If a wave A has one-half the amplitude of an otherwise identical wave B, then the energy of wave A is how many times that of wave B? a. 1/4 b. 1/2 c.1 d. 2 e. 4 6. wave interference occurs for (may be more than one) a. sound waves. b. light waves. d. None of the above choices are correctExplanation / Answer
1.a) vibration
a periodic wiggle in time is called a vibration, while a wiggle in space and time is a wave. Think of a single guitar string vibrating, while a large swell of ocean water is a wave!
2.b) independent
Velocity is independent of the source velocity as it is a function of position and time
3.c) greater
Both the frequency and wavelength undergo change when the source is moving.
4.d) not enough information since we have not been give their speeds
If both the source and observer are moving in same direction then the observed fequency will remain the same as frequency doesnt depend on speed
5.b) 1/2
The larger the wavelength the greater the energy of wave
6. a)(b)(c)
Interfrence occur in all sound , light and water waves