L> Ch 8, gravity Excursions inPhysicsHomework, chapter 11: Waves(this is thing 11 of Adventures in Physics, easily accessible only online)Ch 11, Waves; 1, 3, 7, 8, 9, 12, 14, 15| ago to3050"s home Page | Backto Calendar | ToC,Ch 11 | Ch 12, Sound andMusic | 1. If the frequency the a wave 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 put your fingertip in a swimming pool of water and also repeatedlymove the up and also down, friend will create circular water waves that moveout from the point. What will occur to the wavelength of thesewaves if you relocate your finger up and down an ext slowly (or lessfrequently)?As the frequency slow down, the wavelength increases.4. Together a tide goes by, how much does it move during oneperiod?During each period, the tide moves one wavelength.5.If the amplitude of a tide is enhanced 10%, whathappens to the wave speed?The wavespeed go not adjust with the period.6. Can a transverse wave travel along a Slinky toy?A Slinky toy can support both a transverse wave and a longitudinal wave.7. Deserve to a sound tide be polarized?Sound is a longitudinal wave so it have the right to not it is in polarized.8. Deserve to a light tide be polarized?Light is a transverse tide so it deserve to be polarized.9. If exactly the very same signal is sent out to two speakers, whatwill a listener hear together she walks along a line parallel come thespeakers (as illustrated in the sketch)? The sound tide from the 2 speakers will include together by superposition. At some points, the 2 sound waves will be advertise the air molecules in the same direction and we will certainly hear a big amplitude; this is called constructive interference or a sound maximum. At other points, the 2 sound waves will certainly be advertise the air molecule in the opposite direction and also we will hear a small amplitude; this is called devastating interference or a sound minimum. 12. Why does the amplitude of a water wave decrease as the wavespreads out from its source?The energy -- or power -- in the tide is spread out over a better area so the amplitude is smaller.14. Carefully hold a steel rod horizontally at its mid-point.If you then strike the horizontally on its end, what sort of wave willbe produced in the rod? If you climate strike the vertically top top its end,what kind of wave will be produced in the rod? will certainly the sound friend hearbe the exact same or various for these 2 cases? Why?Striking it horizontally ~ above its finish should cause a longitudinal wave v the rod. Striking that vertically on its end should cause a transverse tide along the rod. The 2 waves space quite different so their wave velocities will be quite various and, therefore, their resonant frequencies will certainly be fairly different. The is, the sound produced will be fairly different.15. Define some usual examples of resonance.Perhaps the an initial example the resonance that pertains to mind is the resonance that a pendulum as checked out in a typical playground swing. The resonance that a pendulum in a clock is an additional ready example. Resonance is likewise used in tuning a radio or television. Resonance the air molecule is affiliated in the blue color of the sky. Resonance is offered in every musical instrument. usual Multiple ChoiceQuestions:1. Favor a transverse wave, a longitudinal wave has actually a/anA) amplitude B) frequency C) wavelength D) all of the above2. Which of the following is a longitudinal wave?A) irradiate B) tide on a cable C) sound D) all of the above3. The separation, personal, instance vibrations or disturbances the a transverse wavemoveA) in the exact same direction together the wave itself B) perpendicular to the wave itself4. A wave has actually a frequency the 100 Hz and also travels 25 m in onesecond. It hasA) a wave rate of 25 m/s and also a wavelength the 4 m. B) a wave rate of 25 m/s and a wavelength the 0.25 m. C) a wave speed of 100 m/s and a wavelength the 25 m D) a wave speed of 100 m and a wavelength that 4 m5. For standing waves, nodes areA) always a wavelength apart B) regions of biggest amplitude C) regions of best frequency D) always two wavelength apart6. For standing waves, antinodesA) are fifty percent a wavelength apart B) have the biggest amplitude C) alternative with nodes D) every one of the above7. Because that standing tide on a string,A) a node is located at each end B) a entirety number times half the wavelength equals the length of the string C) the totality "pattern" of standing tide occurs just for certain frequencies D) every one of the above8. For standing waves on a string,A) one antinode is located at each finish B) the length of the string equates to the wavelength divided by a whole number C) the amplitude is proportional to the frequency D) all of the above E) no one of the above9. Top top a string that is 1.0 m long, stand waves may be formedwith the following 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 above the wavelength C) a wave is reflected earlier on itself D) a wave"s period equals that wavelength11. A node isA) constantly in the middle of a standing wave B) a place of maximum amplitude C) a position of minimum amplitude D) equal to the basic frequency 12. A bobber ~ above a fishing line oscillates up and 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 heat oscillates up and downtwo times per second 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 D) 980 cm/s14. If you placed your fingertip in a pool of water and repeatedlymove that up and also down, you will develop circular water waves the moveout from that point. What will happen to the wavelength that thesewaves if you relocate your finger up and down an ext slowly (or lessfrequently)?A) rise B) remain the very same C) diminish Answers to these typical Multiple ChoiceQuestions:1. Favor a transverse wave, a longitudinal wave has a/anA) amplitude B) frequency C) wavelength D) every one of the above2. I beg your pardon of the following is a longitudinal wave?A) light B) tide on a string C) sound D) all of the above3. The separation, personal, instance vibrations or disturbances of atransverse tide moveA) in the very same direction together the tide itself B) perpendicular come the wave itself4. A wave has actually a frequency of 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 rate of 25 m/s and a wavelength of 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 speed of 100 m and also a wavelength of 4 m5. Because that standing waves, nodes areA) always a wavelength apart; nodes are half a wavelength personal B) areas of best amplitude; nodes have actually minimum (zero!) amplitude C) areas of best frequency; all parts of a standing wave have actually the very same frequency D) always two wavelength apart ; nodes are half a wavelength apart E) no one of the above6. Because that standing waves, antinodesA) are half a wavelength personally B) have actually the best amplitude C) alternative with nodes D) all of the above7. Because that standing tide on a string,A) a node is located at each finish B) a entirety number times fifty percent the wavelength equals the length of the wire C) the entirety "pattern" of standing tide occurs only for particular 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 amounts to the wavelength separated by a totality number C) the amplitude is proportional to the frequency D) every one of the above E) nobody of the above9. Top top a string the is 1.0 m long, was standing waves might 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 waves can take place whenA) the frequency amounts to the wavelength B) the amplitude above the wavelength C) a wave is reflected earlier on chin D) a wave"s duration equals that wavelength11. A node isA) always in the center of a standing tide B) a position of best amplitude C) a place of minimum amplitude D) same to the fundamental frequency 12. A bobber ~ above 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 top top 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 swimming pool of water and repeatedlymove it up and also down, you will create circular water waves that moveout from the point.


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