What elements are found in typical magnets?
What aren't most metal magnetic?
Iron, Nickel, Cobalt (Fe, Ni , Co)
Most metals have PAIRED electrons whose SPIN is CANCELED.
100
how many different charges are there? NAME the charges then tell the particle that has that charge.
TWO CHARGES: Pos = Proton , Neg = electron
DON'T screw it up and say "Neg = Neutron"
100
What is the unit for Voltage, Current, and Resistance
Volts, Amperes, Ohms
100
Which EM wave has the shortest wavelength?
What is Gamma Rays
100
Ray diagrams are primarily used to __________
determine the image location and type
200
the source of all magnetism
movement of electric charges
200
Opposite charges _____________ while like charges _________?
Opposites Attract
Like Repel
200
In order for charges to flow from one place to another there must be a ____________ and a ______________
Potential difference(voltage diff) and a conductor
200
a sound wave is a ________________ wave and the disturbance is ___________ to the motion of the wave
Longitudinal ...... Parallel
200
Resonance occurs when.....
an object is forced to vibrate at its natural frequency, amplitude gets LARGER
300
What is the source of Earth's magnetic field? What would happen without it
Moving charges in molten OUTER CORE, inner core is solid.
NO FIELD, no protection from solar wind (high energy charged particles from sun)
300
Two charged sphere are separated by a distance. If the MAGNITUDE of BOTH charges is doubled...how much stronger will the force be.
F = k 2Q 2Q/ d^2
THEREFORE 2 x 2 (both doubled) = 4x
300
A series circuit has __________ path(s) for current to flow while a parallel circuit has __________path(s).
One , 2 or more
300
as you double the frequency of a vibrating object, its period will _____________ (be precise with a number)
HALF (they are inverses, T = 1/F)
300
If two tuning forks are rung at the same time, one is 512Hz then other is 515Hz, what will be heard?
These are called__________
What way behavior causes this?
3 Beats per second.... constructive and destructive interference
400
Regions of electrons aligned in the same direction are said to be a ____________. Inside a strong magnet they are all aligned from _______ to ______
Domains, from SOUTH to NORTH....then they creates a magnetic field AROUND the magnet that goes from NORTH back to SOUTH
400
NON-CONTACT charging where you bring a charged object NEAR a conductor, ground the conductor, then remove the charged object____________________
INDUCTION
400
Name the three parts of a simple circuit and what they "provide" to the circuit
Battery = Potential difference (energy)
Conductors (wires) = electrons and a pathway
resistor = uses energy from battery (friction)
400
The distance between two identical wave parts (crest to crest)
Wavelength
400
What is a natural frequency
lowest frequency an object emits when struck or vibrated
(wine glass or tuning fork)
500
A moving magnet through a coil of wire (solenoid) can induce__________. The _________ the magnet moves the in/out of the solenoid, the greater it flows.
electric current FASTER
500
If you rub a comb against your dog's fur gaining -3x10^9 C of charge, calculate the charge on the dog?
+3x10^9 C (same, but opposite charge...CONSERVATION OF CHARGE)
500
Calculate the total resistance of this complex circuit (on the board)
10 ohms
500
Explain wave interference; describe the two ways it can happen
INTERFERENCE - 2 waves at the same place, same time
CONSTRUCTIVE - LARGER (CREST HITS CREST)
DESTRUCTIVE - SMALLER (CREST HITS TROUGH)
500
Refraction occurs when a wave ___________ and thus __________.
any wave CHANGES MEDIUM (diff n) and changes speed/direction