Reading Quiz

Question 2:

Answer:

1. The highest pitch strings must vibrate the most rapidly and therefore must have the lowest masses, making them easier to break.
2. This is because the strings that need to vibrate quite rapidly need to have the lowest mass. Having the lower mass means it is generally made of a less sturdy material, and over time might break.
3. Their frequencies are much higher so they vibrate much faster. Because they are moving more than other strings, they are most likely to break.
4. They're the ones that are under the most tension. The higher tension creates a stiffer restoring force to keep their pitches the highest.
5. The highest-pitched string is most likely to break because it is the string with the lowest mass. Since it is much smaller, it is more likely to break.
6. The higher pitched strings has more tension.
7. They have to be smaller/higher tension. the higher the pitch, the higher the frequency of the string. In order to obtain the higher frequency, the string must have high tension and low mass, thus making it more weak.
8. The highest pitched string on an instrument has the most tension in it and has the least mass. Tension and mass are both related to the speed at which a string can vibrate. Decreasing the mass or increasing the tension cause a string to vibrate faster, and consequently to have a higher pitch. Since this sting is the thinnest and is pulled the tighest, this would be the string most likely to break on an instrument.
9. The pieces of the highest strings are played under more stress than the lower strings and thus more likely to break. Shorter in length, they curve more sharply when displaced from equilibrium, putting more tension and greater net force on the pieces of the string. Higher pitched strings also vibrate more quickly, which could add stress, and are made of thinner wire, which could decrease its strength.
10. The highest pitched strings are the thinest, making them more prone to be broken.
11. The highest pitched strings on most instruments are the most likely to break because, they are the ones that are pulled the taughtest in the instrument. They are pulled this taught because this makes them vibrate with a higher frequency, and therefore a higher pitch.
12. Because the highest pitched strings must vibrate very rapidly, they must be made of a thin material, and when that thin material is stretched very tightly to ensure equilibrium, its tension is high and it becomes more brittle or easy to break.
13. The highest pitched strings on most instruments are the most likely strings to break because the frequency is high and the string is the tightest.
14. High pitched strings are quite thin, and curve more when plucked. The greater the curve, the greater the restoring force. The net force, however, proves too great for the string, which will cause it to break.
15. Highest pitched strings have the lowest mass and vibrate at the highest frequency. This makes them weaker and more likely to break.
16. Because the highest pitched string needs to have the lowest mass and be able to vibrate very rapidly. The low mass means there is a weaker contact between the many pieces that compose the string because they are smaller and there is less surface contact between the pieces to keep it from breaking.
17. The highest pitch strings have this higher pitch because the stiffness of its restoring forces quickens the vibrations. Stiff restoring forces make these strings subject to greater outward forces and net force when distorted, and when the straight line shaped is distorted the tension may cause the string to break.
18. These are the most taut strings which means they have the highest tension and that can break easier than strings at lower tensions.
19. Because the pitch of the strings in these instruments does not depend on how hard they're vibrating. Rather their pitch corresponds to their stiffness; stiffening the strings quicken their fundamental vibration and increase their pitch. Thus, higher pitched strings are more stiff meaning they are pulled really tight so they are more likely the break or snap more easily than if they were more loose or lower pitched.
21. The pitch is controlled by the frequency of their vibrations and since they must vibrate very rapidly and alot they tend to be the most likely to break.
22. Pitch depends on stiffness and mass. In order to get a higher pitch, the string must be pulled the tightest so that it vibrates with the greatest frequency. At the same time, the string must be thin so it has very little mass. These two elements combined make it easiest for the highest pitched strings to break.
23. Because they vibrate at higher frequencies.

Question 3:

Answer:

1. wave speed = wavelength x frequency
2. wave speed= wavelength x frequency fast traveling waves that are broad move quickly.
3. wave speed= wavelength * frequency
4. The wave speed equals the wavelength times its frequency.
5. wave speed = wavelength x frequency
6. Wave speed = wavelength * frequency Thus frequency and wavelenth are inversely related. Wave speed is directly related to wavelength and frequency.
7. Wave speed= wavelength x frequency The wavelength is inversely proportional to its frequency.
8. The speed of a wave is equal to its wavelength times its frequency.
9. wave speed = wavelength * frequency
10. the wave speed is equal to the wavelength times the frequency.
11. The frequency of a wave, times the wavelength, is equal to the speed that the wave travels. For instance a wave with a high frequency and a big wavelength will travel fast.
12. The speed of a wave is equal to its wavelength times its frequency. Since soundwaves all travel at the same speed there is an inverse relationship between a sound wave's wavelength and frequency.
13. v= wavelength x frequency
14. The speed of a wave is its wavelength divided by its frequency.
15. wave speed=wavelength X frequency
16. wave speed=wavelength x frequency
17. The speed of a wave is equal to the product of the wavelength times its frequency.
18. wave speed = wavelength x frequency
19. wave speed = wavelength x frequency
21. wave speed = wavelength x frequency
22. A wave's speed is equal to its wavelength times its frequency.
23. Waves are "patterns of compressions and rarefactions that travel outward rapidly from their source". The shortest fistance between 2 adjacent crests is the wavelength. (A crest moves one wavelength per virbration cycle) The frequency is the number of vibrations per second.

Question 4:

Answer:

1. I found the first check your understanding confusing, despite the fact that I have some music background.. the first section on sound and music seemed a little out of the ordinary and less science oriented.
2. I'm a bit confused on how an organ pipe works fig-9.2.8
3. The drum sections were the hardest to understand. I know drums can make different pitches, but I dont really understand how that works.
4. I'm confused about why sound would travel faster in helium than in regular air.
5. I was confused by the nodes in the drum and how they affect the air movement
6. I thought the reading on the drum was very interesting to me because I've been in band for a number of years and I've heard firsthand the different pitches on a kettle drum. Unfortunately I didn't really understand what the section was talking about with the vibrational modes and vibrational nodes.
8. I was able to follow the information presented in this reading.
9. playing an organ pipe
10. i think im good. MAybe clarify the way vibrating instruments turn into sound.
11. I am confident with this material that we have just read.
12. I think I understood all of this.
13. I was not confused about anything.
14. i'm confused with the placements of nodes and antinodes.
15. None
16. nada
17. I am confused about the vibrational modes/nodes/antinodes of a drumhead.
18. nothing really
19. I think I understood everything pretty well. I understand magnetic flux but how does changing magnetic flux actually produce electricity like we saw in lab when we made a radio.
21. i understand this pretty well
22. I thought the drum heads were a little confusing.
23. none

Question 5:

Answer:

1. Mixing up some of the right hand rules; some of the more complicated processes such as how an CRT works, etc.
2. Nothing at this time.
3. nothing.
4. Nothing in particular
5. Nothing
6. The lab on sound waves was somewhat confusing. I understood what made the diaphram vibrate but I didn't understand how that produced sound.
8. I'm okay with everything from class at this point.
9. none
10. i am still a little confused about the magnetic fields and current stuff.
11. I think I understand the material from previous classes that we have been going over.
12. I think I'm caught up right now. Could you mention what materials the test will cover in class on wednesday?
13. Im very confused about flux.
14. good with past material, thanks.
15. None
16. i still have a little confusion about the purpose of the "ground" wire in certain setups.
17. I am still having trouble differentiating between all the different right-hand rules we have learned. Also, are we going to discuss the concepts from group exercise #29? I know we observed many things but you said we would explain most of it later.
18. not much, thanks
19. I think I understand everything so far.
21. magnetic flux
22. --
23. flux change