Properties of Waves, Magnetism, & Electricity Unit 4 Summative Assessment

Transcription

1 1. When a sound wave travels through a medium, what is being transmitted in the direction of the movement of the wave? density mass energy velocity 2. An iron rod changes colors when heated in a hot flame. It turns dull red as it heats up and finally into white hot in color. As the rod becomes hot, its heat can be felt in the surrounding are Which type of wave transfers the heat to the surroundings? matter wave periodic wave longitudinal wave electromagnetic wave 3. Which type of wave can transmit energy in a vacuum? light water sound seismic 4. Annie notices a cork floating in a pon She throws a stone at some distance from the cork and observes waves spreading from the place where the stone strikes the water s surface. Which of these can Annie observe as evidence that waves can transfer energy? reduction of velocity of the wave when it strikes the cork vibration of the cork about its mean position after the stone is thrown forward movement of the cork in the water when the waves are formed movement of the water molecules from the place of actual disturbance to the cork 5. In the diagram to the right, a wave is approaching a twig on the surface of a pon Which wave property MOST LIKELY will make the twig move up and down? mass energy velocity acceleration 6. Joe is able to change the stations and make other adjustments to the television without leaving his seat by using a remote control. How does the message travel from the remote control to the television? transfer of energy by sound waves transfer of energy by a magnetic field transfer of energy by an electric current transfer of energy by electromagnetic waves 7. The scale below compares the frequencies of four waves, A, B, C, and D. Which wave has the maximum energy? wave A wave B wave C wave D

2 8. Allen draws four graphs to show the relationship between the energy of a wave and its frequency. Which graph correctly shows that relationship? 9. Which pair of sound frequencies will produce a beat with the LOWEST frequency? 500 Hz and 600 Hz 400 Hz and 450 Hz 500 Hz and 505 Hz 600 Hz and 625 Hz 10. Jessica wants to measure and compare the energies of the radio waves and microwaves emitted from the Sun. Which characteristic of these two waves will BEST help her in comparing and measuring their energies? amplitude direction frequency speed 11. The electromagnetic spectrum below arranges four waves, 1, 2, 3, and 4, in decreasing order of their wavelengths. Which wave has the lowest energy and lowest frequency? Wave 1 Wave 2 Wave 3 Wave A certain wave, we shall name it wave P, of an electromagnetic spectrum is moving with a wavelength of λ. How will its energy change if the wavelength is doubled in length? Energy will be double Energy will be reduced by half. Energy will be the same. Energy will be reduced by one-fourth. 13. Tara studies the wavelengths of different colors of visible light in an electromagnetic spectrum. Based on the wavelength for different colors, which sequence arranges the colors in INCREASING order of their energies? violet, indigo, blue, green, yellow, orange, red violet, green, yellow, indigo, blue, orange, red red, orange, indigo, blue, green, yellow, violet red, orange, yellow, green, blue, indigo, violet 14. Maria is studying the relationships among frequency, wavelength, and the energy of an electromagnetic wave (light). Which of these describes the relationships among these wave characteristics? v = f λ The energy of electromagnetic waves is directly proportional to the frequency and inversely proportional to the wavelength. The energy of electromagnetic waves is inversely proportional to the frequency and directly proportional to the wavelength. The energy of electromagnetic waves is directly proportional to both the frequency and the wavelength. The energy of electromagnetic waves is inversely proportional to both the frequency and the wavelength. 15. Which of these statements correctly describes sound waves?

3 transverse waves that can travel through water longitudinal waves that can travel through water transverse waves that can travel across a vacuum longitudinal waves that can travel across a vacuum 16. An astronaut in a space station was monitoring the waves emitted by a nearby satellite. Which device would be unable to monitor waves emitted from the satellite? a light meter for detecting light waves an x-ray detector for detecting x-rays a microphone for detecting sound waves a radio receiver for detecting radio waves 17. The diagram below shows the behavior of water waves when they encounter a gap in a harbor wall. What will MOST LIKELY happen to the waves if when they pass through the gap? Diffraction will decrease. Diffraction will increase. Refraction will decrease. Refraction will increase. 18. Which diagram shows a ray of light passing through two mediums with the MOST similar indices of refraction? 19. Three electrically charged balloons, A, B, and C, are suspended from strings as shown below. Balloon A attracts balloon B, and balloon B attracts balloon C. If balloon C has a positive charge, what is true about balloons A and B? A and B are both positively charge A and B are both negatively charge A has a positive charge, and B has a negative charge. A has a negative charge, and B has a positive charge 20. What is the direction of flow of electrons in a simple direct-current circuit? Electrons flow from the negative terminal of the battery to the positive terminal in a direct-current circuit. Electrons flow from the positive terminal of the battery to the negative terminal in a direct-current circuit. Electrons flow from the positive terminal of the battery to the negative terminal and then from the negative terminal to the positive terminal in a cyclic manner in a direct-current circuit. Electrons flow from the negative terminal of the battery to the positive terminal and then from the positive terminal to the negative terminal in a cyclic manner in a direct-current circuit. 21. Three light bulbs are attached in a parallel circuit with a battery. If one of the three light bulbs burns out, what will happen to the other two light bulbs in the circuit? They will also burn out. They will not light up as the circuit is broken. They will remain lit despite the burned-out bul Only one of the two remaining bulbs will remain lit.

4 Experiment 1 Victor rubs the glass rod with the piece of silk cloth and brings it near the bits of paper. The paper bits are attracted toward the glass ro Experiment 2 Victor connects a charged glass rod to a metallic sphere through copper wire. Experiment 3 Victor places a charged glass rod near the two uncharged metallic spheres in contact with each other. Experiment 4 Victor connects two identical bulbs in a parallel arrangement. He then connects a 20V cell across this arrangement. 22. In experiment 4 the power source is a 20 V Battery; Therefore the power source is Alternating Current Three Phase A.C. Direct Current Single Phase A.C. 23. Which diagram represents the arrangement of charges after the copper wire has been attached to both the glass tube and the metallic sphere in experiment 2? 24. What would be the current in the circuit in experiment 4 if another battery of 20 V was connected in series with the battery that is already in the circuit? 1A 4A 2A 6A 25. Which fact about static charges can be deduced from experiment 1? Static charges are transferred from one body to the other during rubbing. Static charges are created in the two bodies during rubbing. Unlike charges attract each other. Like charges repel each other.

5 26. Which diagram shows the correct arrangement of charges in experiment 3 after the spheres are separated from each other and the glass rod is removed? 27. What is the total resistance of the circuit in Experiment 4? 2 Ohms 10 Ohms 4 Ohms 40 Ohms 28. What is the Resistance of the R1 Resistor in Experiment 4? 1 Ohms 5 Ohms 2 Ohms 10 Ohms 29. Is the Resistance in the R2 Resistor the Same as the R1 Resistor in Experiment 4? Yes No 30. How is the charge being transferred from the charged wand to the metal sphere in Experiment 3 Conduction Friction Induction 31. How is the charge being transferred from the charged wand to the metal sphere in Experiment 2 Conduction Friction Induction 32. Sarah wraps a coil of insulated copper wire around an iron ro She then passes a current through the wire. What happens to the iron bar when current is passed through the coil? It becomes electrically charge It becomes temporarily magnetize It becomes an electrical insulator. It becomes permanently magnetize 33. Which graph shows the direction of flow of electrons in experiment 4? 34. Which type of current has electrons that flow in only one direction? alternating series direct parallel 35. What are two ways to make the field of an electromagnet stronger? increase the voltage, decrease the current wrap more wire around the iron core, increase the voltage wrap more wire around the iron core, decrease the current replace the iron core with copper, increase the voltage

6 1. B 2. D 3. A 4. B 5. B 6. D 7. D 8. B 9. B 10. C 11. A 12. C 13. D 14. A 15. B 16. B 17. B 18. A 19. C 20. B 21. C 22. B 23. B 24. C 25. B 26. A 27. C 28. C 29. A 30. C 31. A 32. C 33. C 34. B 35. B