How is Light created at the atomic level?
The atom's electron electric magnetic field vibrates
The answer on the test is going to be A, as Mr. Scales, so kindly told us....
What is the Electromagnetic Spectrum in oreder?
Radio Waves, Microwaves, Infared waves, Visible Light, Ultra Violet light, x rays, gamma rays
All velocities are variable except for:
The speed of light
What is Huygen's Principle?
Each point of a wave front acts as a new wave source.
ElectroMagnetic Spectrum ratios of frequency/wavelength
(Less Frequency/Bigger wavelength)/ (More frequency/smaller wavelength)
What is brightness when you have 5 times the original distance
I≈1/d² is the formula for brightness, so I≈1/(5)², and when you simplify it you get, I≈1/25
What is the relationship between incoming and reflected angles
Incoming and reflected light angles are equal
What happens with reflection at the atomic level?
The atom absorbs and reemits the light
Describe the image ray diagram in a plane mirror
d(original)=d(image) It has a virtual image due to apparent source of light ray
What are the Image characteristics of a concave mirror?
Magnifies and Image, converges light rays (mirror caves in)
Like a make-up mirror, a girl's best friend!
What are the Image characteristics of a convex mirror?
Reduces and image, Diverges light rays (Mirror curves out)
Like a security Mirror, that we occasionally catch ourselves looking in!
What Kind of mirror does a telescope have?
What are the three colors of Light?
Red, Blue, and Green
What are the three colors of Pigment?
Yellow, cyan, and magenta
What color is a banana in blue light?
Black (Banana is yellow(R&G) Blue light is on it so it is absorbing all three colors, so it's black)
"Does anyone have a banana and some blue light we can try it with???"
How many filters are needed to block out class light?
We held those little black plastic sheets up to the light and when you put two together it blocked the light, remember?
How many filters are needed to black out water glare?
Like Sunglasses!:) NOT KANYE GLASSES, they will not have the same effect... Sorry Mr. West.
What is light bending going through a lens?
What causes light to bend?
One side of wave changes speed first
What is the index of refraction?
Measure of speed of light changes in media due to its density
Is a concave LENS converging or diverging?
Is a convex LENS converging or diverging?
Is a convex LENS reduced or magnified?
Is a concave LENS reduced or magnified?
Lens curvature affects what two things?
Magnification/reduction and focal length
What would you use to create total internal reflection?
Prisim and fiber optic cables
What is dispersion of a prism?
White light into different colors
What is the cause of a mirage?
Refraction caused by different air temperature and density
What are the two kinds of interference?
In phase and out of phase
What is the end result of the two kinds of interference?
Out of Phase= destructive (decrease amplitude)
Which experiment creates and interference pattern?
twin slit experiment
What is diffraction?
light bending through a slit
How does diffraction grading create colors?
What does the lens resolution depend on?
What does coherent monochromatic mean?
1 wavelength, in phase
How is cd, dvd, and laser data stored?
What are the two kinda of electric charge?
Positive (atoms loses electron) and negative(atom gains electron)
What is charge conservation?
for every positive there is a negative
Rubbing a baloon on hair is an example of?
charge transfer by contact
What makes a metal conductor conduct?
it has loose electrons
Why does a rubbed baloon pick up styrofoam peanuts?
What are the factors in determining force in columb's law?
Why does a Van de Graff have a curved dome instead of a sharp end?
So it has the maximum charge, instead of a leaking charge
How would you create electric potential energy?
Move the electron towards the negative side of the electric field.
If you give one joule/columb what is the result?
What is the volatge of a AA battery?
What is the voltage of a Car battery?
What is the US electric current?
It's 220 volts in the rest of the world, like on the boats in New Zealand, where Mr. Scales is from..
How is a capacitator designed?
With 2 metal plates, one positive, and one negative
What is the insulator in between two metal plates in a capacitator?
What is the electric current unit equivalent to?
1Amp= 1columb/ 1sec
What direction is the electric curent going?
+ --------> - (positive to negative)
What is the difference between electron drift velocity and electric field interaction?
Interaction between electric fields is very, very, fast.
(Mr.scales? What does that random "v" on the board mean? ummm well, it means very? actually it should be very very... Okay Mr.Scales)
What is the difference between AC and DC?
AC=electron changes direction(created by a generator)
DC=electron goes in one direction(created by battery)
What kind of wire is used to decrease resistance?
Thicker, shorter wire (like in a washing machine)
What kind of wire is used for maximum resistance?
a bulb filament (itty bitty wire)
What does V stand for? and what is it measured in?
Voltage, and it's measured in Volts
... duh Mr. Scales
What does I stand for? and what is it measured in?
Current, it's measured in Amps
What does R stand for, and what is it unit of measurement?
Resistance, and it's measured in Ohms
What is the electric power unit of measurement equivalent to Power=IV?
Light(like lightbulbs are measured in watts) is knowledge, and Knowledge is power! :)
Why is electric current distributed at a high voltage?
Higher Voltage=Less resistance!
What are some characteristics of series circuits?
As the Number of bulbs in the circuit increases, Resistance increases.
If one bulb goes out, they all go out, (Not the best idea for a circuit... It's only as strong as it's weakest link!)
And Voltage divides.
What are some characteristics of paralell circuits?
As the Number of Bulbs increases, the amount of resistance decreases.
If one bulb goes out, the others all stay lit, (This is the better circuit plan to use! and that's why it's the brightest of all the circuits...)
I divides, (as in current divides, Not Me.)
Which is the brightest circuit?
Which circuit has the largest voltage drop?
Parallel and a one bulb circuit
(he might have an answer choice that says something like, B and c or something along those lines... You never know what to expect with Gordon...)
Which circuit has the most resistance?
Which has the most current throughout?
Single bulb circuit
If one bulb goes out all do?
What was measured in the electric circuits lab?
Amps and volts
What placement of magnets caused the iron shavings to repel? and which caused it to attract?
The NN magnets caused it to repel, and the NS magnets caused it to Attract
What is the difference between permomagnet and an electromagnet?
Permomagnet: atoms are aligned, (electrons spin)
Electromagnet: The electric current in wire is moving through(like when you rub a piece of magnetite on a needle repeatedly in the same direction, it makes the needle a temporary, or electomagnet.)
Know Your right hand rule..
Sorry, there was no way to right this in a question form:/
Where is the magnetic field inside a solenoid?
A solenoid is a magnetic field located inside a wire loop
Does anyone remember studying this? Cause I sure don't....
What is the magnetic domain?
Then Magnetic domain is aligned iron atoms
How does the loudspeaker method work?
There is an interaction between permant and an electromagent
What makes the motion in an electric meter mechanism?
An electric motor
What is moved in wire to make electricity?
In wire, electrons being moved by magnetic field
When do you have enduced maximum velocity?
When the loop is parallel to the magnetic field
What is lens law?
Introducing current in a loop with a megnetic or another loop?
What is faraday's law?
Farday's law, basically says that Induced Voltage is proportional to the number of loops (The # of loops is determined by the magnetic field strength(Which is The change in magnetic field))
Know what an AC current graph looks like.
Look at your notes, There the answer lies.... ;D
What is the difference between AC vs DC generator construction?
Split ring vs Double ring
What is the US current?
120 volts, 55 hertz
How do you construct an electric motor?
Rotating wire loops between Magnets
What is a transformer used for?
Defeating evil, Go optimus prime! :D
Actually, It's used for transforming voltage.... Lame.
What principle is used in a transformer?
What does the output voltage depend on in a transformer?
What does the input current create in a transformer?
Magnetism (Out put creates electricity)
What is the relationship between self induction and back EMF?
The result of self induction is less efficient than back EMF
What is Back EMF?
Back EMF is when a Magnetic field induces a new current
What does black body radiation and UV breakdown show?
It shows the light as a particle
What are light quanta/photons?
Specific quantity of energy/particle
In the formula E= hf what does E stand for?
E= energy of one photon at a frequency of f
In the formula E= hf what does h stand for?
What does the photoelectric effect do?
It shows light as a particle
What types of technology use the photoelectric effect?
In the formula KE=hf-hfT, what does hf stand for? What does hfT stand for? and what does fT Stand for?
hf= light energy
In the formula KE=hf-hfT, What does hfT stand for?
hfT=work function (energy to free electrons)
In the formula KE=hf-hf₇, what does f₇ Stand for?
fT=Treshold frequency of light
Describe the photo electric effect?
Light hitting metal atoms ejects electrons
What is the compton shift?
Photon wavelength decreases when it hits an electrons
What did Rutherford's experiment show?
Atoms are mostlty empty and radio activity can pass through atoms
What were they looking for in Rutheford's experiment?
They were looking for the Structure of atoms
What is the emission spectra?
ther amount of Light frequency emitted by atoms
How does the number of spectra lines relate to the way electrons change orbit?
They are equal
What did bohr's experiment show?
H emission spectra showed how electrons orbit
What is the dual nature in light and matter?
Light and matter are both wave and particle
What isn the uncertainty principle?
can't know both the position and the momentum of the electron
what is the mechanism fo conductors?
they have lose outer electrons
what are semi conductors made out of?
what are the semi conductors used for?
used for a transitor (switch)
what are diodes?
where current flows in 1 direction
how do diodes relate to AC and DC?
they change AC to DC
what does a transitor do?
amplifies the signal
what makes a super conductor so super?
it has no electric assistance
what are some characteristics of super conductors?
perfect crystal lattice
what is atomic # and atomic mass?
Atomic #: number of protons
mass #: protons plus neutrons
what does E equal in E=mc²?
E= atoms rest energy
What are neutrons?
Neutrons= strong nuclear force
what do neutrons hold together?
what is the cause of unstable nucleus, decay, and radio activity?
It is due to protons repelling!
What are the three types of radiation?
Alpha, Beta, Gamma...
......beginning and end, you're my savior messiah, redeemer and friend! You're my prince of peace and I will live my life for you!
Am I not the only one who sings this song when I hear these three types of radiation?... Maybe so.
What is Beta Decay caused by?
Weak Nuclear force
What is the result of Nuclear decay?
Radio Activity and transmutation
Ahhhh!!!! Mutant ninja turtles!!!!
What is nuclear fission?
a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
What is U-235 used for?
To heat water!
What is an example of nuclear fusion?
What are the matter particles and Proton and Neutron components?
What is the Evolution of the 4 fundamental forces?
What is the evolution of atoms?
Energy --------> Quarks
What is antimatter?
When Protons are negative, and electrons are positive. (Opposite charges)
What is the general theory of relativity?
General theory= Special Theory+Gravity