Make sure that the following simulation runs for next week. Play with the simulation and get a sense of what it is showing.
http://phet.colorado.edu/en/simulation/wave-interference
nm comparison
Wednesday, September 28, 2011
Tuesday, September 27, 2011
Blog Post 3: Waves
Simulations
Questions:
1. which takes more energy, slow up and down, or fast up and down?
Fast up and down uses more energy/calories
2. fast frequency corresponds to low energy or high energy?
High energy
3. Determine the frequency of the provided wave(frequency 27, amplitude 50)in Hz?
1.2 Hz (:83 sec/cycle )
4. Determine the frequency of the provided wave(frequency 100, amplitude 50) in Hz?
1.8 Hz (:55 sec/cycle)
5. Determine the frequency of the provided wave(frequency 27and amplitude 100) in Hz.
1.25 Hz (:80 sec/cycle)
6. What is the wavelength of the provided wave(frequency 27, amplitude 50)in cm?
50 cm
7. What is the wavelength of the provided wave(frequency 100, amplitude 50)in cm?
33cm
33cm
8. Describe the relationships between energy, frequency and wavelength. Include descriptions for relationships of all three.
Frequency, not amplitude, determines energy. (Energy and Amplitude are not related.)
Frequency, not amplitude, determines energy. (Energy and Amplitude are not related.)
Energy is directly proportional to frequency.
Energy inversely proportional to wavelength.
(More energy/frequency= shorter wavelength.
lower energy/frequency= longer wavelength)
NaCl Lab 9/20/11
2) a.)Determine and post the mass of one cube of NaCl. b) Calculate and post the number of moles of NaCl in one cube. c)Calculate and post the number of NaCl molecules in one cube of salt.
a) Molar mass (molecular weight) of one unit cell of NaCl = 233.77 g/mole
Work:
Mass Cl = 35.4527
+ Mass Na = 22.9898
NaCl Molecule 58.443 grams/mole * 4 = 233.77 grams/mole in a NaCl Unit Cell
b) # of moles of NaCl in one unit cell = 1.459238452 E^ -22 grams
Work:
233.77 grams =1.459238452 E -22 grams
6.02 x 10^23 atoms
c) # of molecules in one unit cell of salt = 4
Work:
Mass Cl = 35.4527
+ Mass Na = 22.9898
NaCl Molecule 58.443 grams/mole * 4 = 233.77 grams/mole in a NaCl Unit Cell
b) # of moles of NaCl in one unit cell = 1.459238452 E^ -22 grams
Work:
233.77 grams =1.459238452 E -22 grams
6.02 x 10^23 atoms
c) # of molecules in one unit cell of salt = 4
3) a) Determine the dimension of one cube of salt. b) Based on the dimensions determined by the unit cell model, determine and post the number of NaCl in one cube of salt.
a) one cube of salt = .7mm
b) 5.49153314 E 16nm NaCl in one salt cube.
Here is our work:
[.543 nm in a unit cell, 1,000,000nm=1m, 543,000 nm in a 1mm cube of salt. Our cube of salt is .77mm. Therefore, .543nm * .7mm = 380,100 nm. We now have to cube it (^3) to get the volume... 380,100^3= 5.49153314 E 16nm in one salt cube]
a) one cube of salt = .7mm
b) 5.49153314 E 16nm NaCl in one salt cube.
Here is our work:
[.543 nm in a unit cell, 1,000,000nm=1m, 543,000 nm in a 1mm cube of salt. Our cube of salt is .77mm. Therefore, .543nm * .7mm = 380,100 nm. We now have to cube it (^3) to get the volume... 380,100^3= 5.49153314 E 16nm in one salt cube]
Tuesday, September 20, 2011
Blog Post 1: Describe 10nm and mole of atoms
A MOLE of Atoms=
- 6.02 X 10^23 carbon atoms.
- 15 trillion earths
- The quantity of anything. Any time you want to refer to a large number of things. It's easier to say the unit "mole", than to write 6.02 x 10^23.
- Gives us a consistent method to convert between atoms/ molecules and grams.
- Although it doesn't seem like it at first, once one becomes familiar with a mole, it will be as normal as a dozen or a byte.
- If you had a mole of pennies, you could give out enough money to everyone in the world so that they could spend a million dollars every hour, day and night, for the rest of their lives.
- If you had exactly one mole of sheets of paper, you could make one million equal stacks from sea level on the earth that would pass the sun.
- Given that the volume of a grain of sand is approximately 10-12 m3, and given that the area of the United States is about 1013m2, it therefore follows that a mole of sand grains would cover the United States in approximately one centimeter of sand.
10 NANOMETERS =
- 1nm=10^ -9m (reduced 1 billion meters)
- 10nm= 10^ -8m (.000000001)
- 100nm= 10^ -7m
- 1,000nm= 10^ -6m = 1mm
- size of a virus
- Size of a cell wall
- as a mm is to a km a nm is to a m
- 10 nm = 10 nanometres = 10−8 metres
- 10 nm — lower size of tobacco smoke
- 6.02 X 10^23 carbon atoms.
- 15 trillion earths
- The quantity of anything. Any time you want to refer to a large number of things. It's easier to say the unit "mole", than to write 6.02 x 10^23.
- Gives us a consistent method to convert between atoms/ molecules and grams.
- Although it doesn't seem like it at first, once one becomes familiar with a mole, it will be as normal as a dozen or a byte.
- If you had a mole of pennies, you could give out enough money to everyone in the world so that they could spend a million dollars every hour, day and night, for the rest of their lives.
- If you had exactly one mole of sheets of paper, you could make one million equal stacks from sea level on the earth that would pass the sun.
- Given that the volume of a grain of sand is approximately 10-12 m3, and given that the area of the United States is about 1013m2, it therefore follows that a mole of sand grains would cover the United States in approximately one centimeter of sand.
10 NANOMETERS =
- 1nm=10^ -9m (reduced 1 billion meters)
- 10nm= 10^ -8m (.000000001)
- 100nm= 10^ -7m
- 1,000nm= 10^ -6m = 1mm
- size of a virus
- Size of a cell wall
- as a mm is to a km a nm is to a m
- 10 nm = 10 nanometres = 10−8 metres
- 10 nm — lower size of tobacco smoke
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