L> Ch 8, gravity Excursions inPhysicsHomework, chapter 11: Waves(this is thing 11 that Adventures in Physics, accessible only online)Ch 11, Waves; 1, 3, 7, 8, 9, 12, 14, 15| back to3050"s house Page | Backto Calendar | ToC,Ch 11 | Ch 12, Sound andMusic | 1. If the frequency the a wave is increased, what wake up to itswavelength?As the frequency increases, the wavelength decreases. 2. If the frequency that a wave is doubled, what wake up to itswavelength?If the frequency is doubled, the wavelength is only half as long.3. If you put your fingertip in a pool of water and also repeatedlymove the up and down, friend will develop circular water waves the moveout from the point. What will occur to the wavelength of thesewaves if you move your finger up and also down an ext slowly (or lessfrequently)?As the frequency slow down, the wavelength increases.4. As a tide goes by, how far does that move throughout oneperiod?During each period, the tide moves one wavelength.5.If the amplitude the a tide is raised 10%, whathappens come the wave speed?The wavespeed does not adjust with the period.6. Can a transverse wave travel along a Slinky toy?A Slinky toy have the right to support both a transverse wave and a longitudinal wave.7. Deserve to a sound tide be polarized?Sound is a longitudinal tide so it can not be polarized.8. Have the right to a light tide be polarized?Light is a transverse tide so it can be polarized.9. If precisely the exact same signal is sent to two speakers, whatwill a listener hear together she walks follow me a line parallel to thespeakers (as portrayed in the sketch)? The sound waves from the two speakers will include together by superposition. At part points, the two sound waves will be advertise the air molecule in the same direction and we will certainly hear a huge amplitude; this is referred to as constructive interference or a sound maximum. At other points, the two sound waves will certainly be pushing the air molecules in opposing direction and also we will certainly hear a small amplitude; this is called disastrous interference or a sound minimum. 12. Why does the amplitude of a water tide decrease as the wavespreads the end from that is source?The energy -- or strength -- in the tide is spread out out end a better area for this reason the amplitude is smaller.14. Closely hold a steel rod horizontally in ~ its mid-point.If you then strike it horizontally on its end, what kind of tide willbe created in the rod? If you climate strike the vertically on its end,what type of wave will certainly be produced in the rod? will the sound friend hearbe the same or different for these two cases? Why?Striking the horizontally ~ above its end should reason a longitudinal wave v the rod. Striking it vertically top top its end should reason a transverse wave along the rod. The two waves space quite various so their tide velocities will be quite different and, therefore, their resonant frequencies will be rather different. That is, the sound produced will be fairly different.15. Explain some typical examples that resonance.Perhaps the an initial example that resonance that involves mind is the resonance of a pendulum as viewed in a typical playground swing. The resonance of a pendulum in a clock is an additional ready example. Resonance is also used in tuning a radio or television. Resonance the air molecule is associated in the blue shade of the sky. Resonance is offered in every musical instrument. usual Multiple ChoiceQuestions:1. Choose a transverse wave, a longitudinal wave has actually a/anA) amplitude B) frequency C) wavelength D) all of the above2. I m sorry of the complying with is a longitudinal wave?A) light B) tide on a cable C) sound D) all of the above3. The separation, personal, instance vibrations or disturbances of a transverse wavemoveA) in the same direction as the wave itself B) perpendicular come the tide itself4. A wave has a frequency of 100 Hz and also travels 25 m in onesecond. The hasA) a wave speed of 25 m/s and a wavelength the 4 m. B) a wave speed of 25 m/s and also a wavelength that 0.25 m. C) a wave rate of 100 m/s and a wavelength the 25 m D) a wave rate of 100 m and also a wavelength that 4 m5. Because that standing waves, nodes areA) always a wavelength personally B) areas of biggest amplitude C) areas of biggest frequency D) constantly two wavelength apart6. Because that standing waves, antinodesA) are half a wavelength personal B) have actually the biggest amplitude C) alternating with nodes D) every one of the above7. Because that standing waves on a string,A) a node is situated at each finish B) a totality number times fifty percent the wavelength amounts to the length of the cable C) the entirety "pattern" the standing waves occurs just for particular frequencies D) all of the above8. For standing waves on a string,A) an antinode is located at each end B) the size of the string equates to the wavelength divided by a totality number C) the amplitude is proportional to the frequency D) every one of the above E) no one of the above9. ~ above a string that is 1.0 m long, standing waves may be formedwith the adhering to wavelengths:A) 1.0 m, 2.0 m, 3.0 m B) 1.0 m, 2.0 m, 4.0 m C) 3.0 m, 1.5 m, 0.75 m D) 2.0 m, 1.0 m, 0.5 m 20. Standing tide can take place whenA) the frequency equates to the wavelength B) the amplitude over the wavelength C) a wave is reflected ago on chin D) a wave"s duration equals its wavelength11. A node isA) constantly in the middle of a standing tide B) a position of maximum amplitude C) a place of minimum amplitude D) equal to the fundamental frequency 12. A bobber ~ above a fishing heat oscillates up and also downthree times per second as wavespass by. The waves have a frequency ofA) (1/3) Hz B) 3 Hz C) (1/3) sec D) 3 sec13. A bobber ~ above a fishing line oscillates up and also downtwo time per second as wavespass by. The waves have a wavelength the 10 cm. The waves aretraveling atA) 5 cm/s B) 10 cm/s C) 20 cm/s D) 980 cm/s14. If you placed your fingertip in a pool of water and repeatedlymove it up and also down, girlfriend will create circular water waves that moveout from the point. What will take place to the wavelength of thesewaves if you move your finger up and down much more slowly (or lessfrequently)?A) increase B) stay the very same C) decrease Answers to these usual Multiple ChoiceQuestions:1. Choose a transverse wave, a longitudinal wave has a/anA) amplitude B) frequency C) wavelength D) every one of the above2. I m sorry of the following is a longitudinal wave?A) light B) wave on a wire C) sound D) every one of the above3. The separation, personal, instance vibrations or disturbances that atransverse tide moveA) in the same direction as the wave itself B) perpendicular come the tide itself4. A wave has a frequency that 100 Hz and travels 25 m in onesecond. That hasA) a wave speed of 25 m/s and also a wavelength that 4 m. B) a wave speed of 25 m/s and also a wavelength that 0.25 m. V = (wavelength) x (frequency) v = 25 m/s = (wavelength) x (100 Hz) 25 m/s = (wavelength) x (100 1/s) wavelength = 0.25 m C) a wave rate of 100 m/s and a wavelength the 25 m D) a wave rate of 100 m and a wavelength that 4 m5. Because that standing waves, nodes areA) constantly a wavelength apart; nodes are fifty percent a wavelength personally B) areas of biggest amplitude; nodes have actually minimum (zero!) amplitude C) regions of biggest frequency; all components of a standing wave have the very same frequency D) always two wavelength apart ; nodes are half a wavelength personally E) no one of the above6. For standing waves, antinodesA) are half a wavelength personal B) have actually the biggest amplitude C) alternative with nodes D) all of the above7. For standing waves on a string,A) a node is situated at each finish B) a whole number times fifty percent the wavelength equates to the length of the string C) the whole "pattern" that standing tide occurs just for certain frequencies D) every one of the above8. Because that standing waves on a string,A) an antinode is situated at each finish B) the size of the string equates to the wavelength split by a entirety number C) the amplitude is proportional come the frequency D) every one of the over E) none of the above9. Top top a string that is 1.0 m long, stand waves may be formedwith the adhering to wavelengths:A) 1.0 m, 2.0 m, 3.0 m B) 1.0 m, 2.0 m, 4.0 m C) 3.0 m, 1.5 m, 0.75 m D) 2.0 m, 1.0 m, 0.5 m 10. Standing tide can take place whenA) the frequency equals the wavelength B) the amplitude above the wavelength C) a tide is reflected ago on itself D) a wave"s duration equals that is wavelength11. A node isA) always in the center of a standing wave B) a position of best amplitude C) a position of minimum amplitude D) same to the basic frequency 12. A bobber on a fishing heat oscillates up and also downthree time per second as wavespass by. The waves have actually a frequency ofA) (1/3) Hz B) 3 Hz C) (1/3) sec D) 3 sec13. A bobber ~ above a fishing line oscillates up and also downtwo time per 2nd as wavespass by. The waves have a wavelength the 10 cm. The tide aretraveling atA) 5 cm/s B) 10 cm/s C) 20 cm/s f = 2 Hz = 2 cyc/s v = (wavelength) x (frequency) v = (10 cm) x ( 2 / s) v = 20 cm/s D) 980 cm/s14. If you put your fingertip in a pool of water and repeatedlymove the up and also down, girlfriend will develop circular water waves the moveout from the point.


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What will take place to the wavelength the thesewaves if you relocate your finger up and down an ext slowly (or lessfrequently)?A) rise v = (wavelength) x (frequency) A decrease in frequency means an increase in wavelength. B) remain the very same C) decrease| earlier to 3050"sHome page | Backto Calendar | ToC,Ch 11 | Ch 12, Sound andMusic | (C) 2003, Doug Davis; all legal rights reserved