Ch4a review answers
Draw a wave. Label the crest, trough, amplitude, and wavelength.
Describe the relationship between frequency and wavelength; c=wavelength * frequency; indirect describe the relationship between frequency and energy; E= plank's constant * frequency
Which is the high energy end of the spectrum? violet Give an example of a high energy invisible radiation. uv or xray
Which end of the spectrum has the highest frequencies? violet
List the 5 atomic models we studied. Make a drawing of each.
historical order: d, t, r,b, q
Match these statements with a model
gold foil - r
cathode ray - t
spectrum - b
cloud - q
uncertain -q
probability -q
billiard ball model - d
plum pudding model - t
discovered 1st sub atomic particle - t
orbits - b
heisenberg - q
shroedinger -q
planetary model -b
What did you learn about fireworks? colors are caused by elements as we saw in class Flares? Mg bright light, Sr, red color
What is the difference between a continuous and a bright light spectrum? rainbow is all colors = continuous; bright light, individual lines of only some colors separated by darkness= spectrum of elements. Give examples of each
Read the new particle article and videos we watched.
What and where is FermiLab? Illinois LHC? cern, switzerland/france border
What is a quark? makes up neutrons and protons. What is a Higgs field and Higgs boson? a higgs field is made of higgs bosons; their interactions with other particles give these particles mass.
What is the excited state and ground state for electrons?
What causes an electron to become excited?
What is observed when an electron returns to the ground state?
When energy is added, electrons go to higher level = excited state. When they fall back down to original level (ground state) they give off energy as visible light
What does wave particle duality of electrons mean? electrons and light have 2 natures, they have both particle and a wave properties.
Calculate the moles and atoms in a penny made before 1982; . calculate how many atoms you could give each person in Peoria area. (Population 200,000)
3.10g* 1mole Cu/63.546g= .0488moles* 6.02*1023 atoms/ 1mole = 2.94*1022 atoms / 3.74*105 = 7.86*1016 atoms per peorian
What is a prism? What does it do? a device that separates light into different colors (wavelengths)
What can you say about the electric pickle? because pickles are
'pickled' in salt water, the electricity excited the electrons in the sodium of salt, causing the pickle to glow the characteristic color of sodium - yellow orange.
47. E=hv; 1.55*10^-24J = 6.626 * 10^-36 j*s * v; v = 2.34 * 109 Hz
49. Bohr definite orbits, Schroedinger areas of probability; both involve energy levels
50. a. E=hv : 3.37 *10^-19j = 6.626 * 10^-36 j*s * v; v = 5.09 * 1014 Hz
b. c=wavelength * frequency; 3.00 * 10^8m/s = wavelength * 5.09 * 1014 Hz ; wavelength = 5.90 * 10-7 m
don’t forget demos… densitee, sodas, silent, pickle, exploding home
Draw another wave with a higher frequency.