Tuesday, September 27, 2011

Blog Post 3: Waves



http://phet.colorado.edu/

Simulations: http://phet.colorado.edu/en/simulation/wave-on-a-string

Questions:

1. which takes more energy, slow up and down, or fast up and down?
Fast up and down requires more energy
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?
.98 hz
4. Determine the frequency of the provided wave(frequency 100, amplitude 50) in Hz?
3.7 hz
5. Determine the frequency of the provided wave(frequency 27and amplitude 100) in Hz?
.96 hz
6. What is the wavelength of the provided wave(frequency 27, amplitude 50)in cm?
59 cm
7. What is the wavelength of the provided wave(frequency 100, amplitude 50)in cm?
17 cm
8. Describe the relationships between energy, frequency and wavelength. Include descriptions for relationships of all three.
Waves with higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths. Frequency is determined by the amount of energy.

Blog Post 2: Unit Cell of NaCl

Here's our NaCl Unit Cell:

Length of Unit Cell: 4 cm, 4.0*10^6 nm, 4.0*10^7 angstroms, .004 meters
Width of Unit Cell: 4 cm, 4.0*10^6 nm, 4.0*10^7 angstroms, .004 meters
Height of Unit Cell: 4 cm, 4.0*10^6 nm, 4.0*10^7 angstroms, .004 meters

Mass of 1 NaCl cube: 3.1*10^-4
Moles in 1 NaCl cube: 5.304*10^-6
Molecules in 1 NaCl cube: 1.86682*10^20