L> Ch 8, gravity Excursions inPhysicsHomework, chapter 11: Waves(this is chapter 11 that Adventures in Physics, obtainable only online)Ch 11, Waves; 1, 3, 7, 8, 9, 12, 14, 15| earlier to3050"s residence Page | Backto Calendar | ToC,Ch 11 | Ch 12, Sound andMusic | 1. If the frequency the a tide is increased, what happens to itswavelength?As the frequency increases, the wavelength decreases. 2. If the frequency that a tide is doubled, what wake up to itswavelength?If the frequency is doubled, the wavelength is only fifty percent as long.3. If you placed your fingertip in a swimming pool of water and also repeatedlymove the up and also down, girlfriend will produce circular water waves that moveout from that point. What will occur to the wavelength that thesewaves if you move your finger up and down more slowly (or lessfrequently)?As the frequency slows down, the wavelength increases.4. Together a wave goes by, how far does that move during oneperiod?During each period, the tide moves one wavelength.5.If the amplitude of a tide is raised 10%, whathappens come the tide speed?The wavespeed walk not readjust with the period.6. Deserve to 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. Can a sound wave be polarized?Sound is a longitudinal wave so it have the right to not be polarized.8. Can a light wave be polarized?Light is a transverse wave so it deserve to be polarized.9. If precisely the same signal is sent to two speakers, whatwill a listener hear as she walks follow me a heat parallel come thespeakers (as depicted in the sketch)? The sound tide from the two speakers will include together by superposition. At part points, the two sound waves will certainly be advertise the air molecules in the very same direction and we will hear a large amplitude; this is called constructive interference or a sound maximum. At other points, the 2 sound waves will be pushing the air molecules in the opposite direction and also we will hear a little amplitude; this is called terrible interference or a sound minimum. 12. Why go the amplitude that a water tide decrease as the wavespreads the end from that is source?The energy -- or strength -- in the tide is spread out out over a greater area for this reason the amplitude is smaller.14. Carefully hold a steel rod horizontally at its mid-point.If you climate strike that horizontally top top its end, what kind of wave willbe created in the rod? If you then strike it vertically ~ above its end,what sort of wave will be created in the rod? will certainly the sound you hearbe the same or different for these two cases? Why?Striking it horizontally top top its finish should reason a longitudinal wave with the rod. Striking that vertically ~ above its finish should cause a transverse wave along the rod. The two waves are quite various so their tide velocities will certainly be quite different and, therefore, their resonant frequencies will be quite different. The is, the sound produced will be rather different.15. Define some typical examples the resonance.Perhaps the very first example the resonance that comes to mind is the resonance that a pendulum as watched in a common playground swing. The resonance that a pendulum in a clock is another ready example. Resonance is likewise used in tuning a radio or television. Resonance the air molecules is affiliated in the blue shade of the sky. Resonance is offered in every music instrument. typical Multiple ChoiceQuestions:1. Like a transverse wave, a longitudinal wave has actually a/anA) amplitude B) frequency C) wavelength D) all of the above2. I beg your pardon of the following is a longitudinal wave?A) irradiate B) tide on a string C) sound D) all of the above3. The separation, personal, instance vibrations or disturbances that a transverse wavemoveA) in the same direction together the wave itself B) perpendicular come the tide itself4. A wave has actually a frequency that 100 Hz and also travels 25 m in onesecond. That hasA) a wave rate of 25 m/s and also a wavelength that 4 m. B) a wave speed of 25 m/s and a wavelength of 0.25 m. C) a wave speed of 100 m/s and also a wavelength of 25 m D) a wave speed of 100 m and a wavelength of 4 m5. Because that standing waves, nodes areA) always a wavelength personal B) regions of biggest amplitude C) regions of best frequency D) constantly two wavelengths apart6. For standing waves, antinodesA) are fifty percent a wavelength personally B) have actually the biggest amplitude C) alternating with nodes D) all of the above7. For standing tide on a string,A) a node is located at each end B) a entirety number times half the wavelength equates to the size of the string C) the whole "pattern" of standing waves occurs just for specific frequencies D) all of the above8. For standing waves on a string,A) one antinode is situated at each finish B) the length of the string amounts to the wavelength divided by a whole number C) the amplitude is proportional to the frequency D) every one of the over E) no one of the above9. Top top a string that is 1.0 m long, stand waves might 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 waves can occur whenA) the frequency equates to the wavelength B) the amplitude exceeds the wavelength C) a wave is reflected back on itself D) a wave"s period equals that is wavelength11. A node isA) constantly in the middle of a standing tide B) a position of preferably 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 2nd 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 downtwo times per second as wavespass by. The waves have actually a wavelength the 10 cm. The tide aretraveling atA) 5 cm/s B) 10 cm/s C) 20 cm/s D) 980 cm/s14. If you put your fingertip in a pool of water and also repeatedlymove the up and also down, friend will develop circular water waves the moveout from that point. What will occur to the wavelength of thesewaves if you move your finger up and also down more slowly (or lessfrequently)?A) increase B) continue to be the same C) diminish Answers to these 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 beg your pardon of the following is a longitudinal wave?A) irradiate B) wave on a cable C) sound D) every one of the above3. The individual vibrations or disturbances of atransverse tide moveA) in the same direction together the wave itself B) perpendicular come the wave itself4. A wave has actually a frequency the 100 Hz and also travels 25 m in onesecond. It 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 the 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 speed of 100 m/s and also 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 apart B) regions of greatest amplitude; nodes have actually minimum (zero!) amplitude C) regions of biggest frequency; all components of a standing wave have the exact same frequency D) always two wavelengths apart ; nodes are half a wavelength personally E) none of the above6. For standing waves, antinodesA) are fifty percent a wavelength apart B) have the biggest amplitude C) alternate 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 whole number times half the wavelength equates to the length of the wire C) the entirety "pattern" that standing tide occurs just for specific frequencies D) all of the above8. For standing waves on a string,A) one antinode is located at each end B) the size of the string equals the wavelength divided by a entirety number C) the amplitude is proportional come the frequency D) all of the over E) nobody of the above9. Top top a string that is 1.0 m long, stand waves may be formedwith the complying with 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 happen whenA) the frequency amounts to the wavelength B) the amplitude over the wavelength C) a wave is reflected ago on itself D) a wave"s period equals its wavelength11. A node isA) always in the middle of a standing tide B) a place of maximum amplitude C) a position of minimum amplitude D) same to the fundamental frequency 12. A bobber on a fishing heat oscillates up and 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 times per 2nd as wavespass by. The waves have a wavelength that 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 placed 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.


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