Study Physics Sem 2 Review Flash Cards

 
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Physics Sem 2 Review

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What factors determine the resistance of a resistor?
type of materical, length, width, and temperature
What are the different ways an object can be charged?
friction, contact, induction
Which colored lights make up white?
red, blue, and green
Which colored lights make up yellow?
red and green
Which colored lights make up magenta?
red and blue
Which colored lights make up cyan?
blue and green
What is the equation to find the equivalent resistance in a parallel circuit?
R(eq)= (1/R₁+1/R₂+...)^-1
What is the equation to find the equivalent resistance in a series circuit?
R(eq)= R₁+R₂+...
What type of circuit doesn't decrease the power to the loads as more are added?
parallel
What type of circuit has junctions?
parallel
What type of circuit uses the least total power?
series
What type of circuits requires all elements to work?
series
What is the difference between series and parallel circuits?
series: elements are only in 1 path
parallel: elements are in multiple paths
What type of devices use dc?
ones that use batteries
What type of devices use ac?
ones that you plug in
What does ac and dc stand for?
ac: alternating current
dc: direct current
What's the difference between ac and dc?
ac: current goes back and forth
dc: current goes only in 1 direction
What is the equation that relates the current, voltage, and resistance in a circuit? (Ohm's Law)
I = V/R
What is the equation for power?
P = IV
P = V²/R
What is power in the traffic analogy?
packages per sec (per unit time)
What is the unit for power?
watts (WO)
What is power?
energy per unit time
What is charge in the traffic analogy?
trucks
What is resistance in the traffic analogy?
speed bumps
What are the units for resistance?
ohms (Ω)
What is resistance?
anything that slows down the flow of charge
What is potential difference in the traffic analogy?
the steepness of the hill
What are the units for potential difference?
volts (V)
What is potential difference/voltage?
electric pressure that causes charge to move
What is current in the traffic analogy?
the flow of cars
What is the unit for current
amperes (A)
What is current?
the movement of charge
What is charge polarization?
when a charged object is brought next to a neutral insulator and one side of the insulator becomes slightly positive while other become slightly positive
What atomic property determines whether a given material is a conductor or insulator?
whether the electrons are tightly bound to the atom (insulators) or free (conductors)
How do like charges interact? Unlike?
likes repel
unlikes attract
What's the difference between polarized and unpolarized light
polarized light oscillates only in one plane
What are the primary colors for pigments?
cyan, magenta, yellow
What are the primary colors of light?
red, blue, green
What type of surfaces produce specular reflection? Diffuse reflection?
specular: smooth surfaces
diffuse: rough surfaces
What is the difference between specular and diffuse reflection?
specular is when light reflects in one direction, diffuse is when is reflects in multiple direcitons
What is the relationship between decibel levels, intensity, and loudness
for every 10 dB increase, the intensity is multiplied by 10, and the loudness is multiplied by 2
What happens when sound interferes constructively?
louder sound
What happens when sound interferes destructively?
lower or no sound
What are the units for loudness?
decibels
In which of the 3 media (solid, liquid, gas) is sound fastest? slowest?
fastest in solid
slowest in gas
what are ultrasonic sounds?
sounds above the range for human hearing
What are infrasonic sounds?
sounds below the range for human hearing
What the range for human hearing?
20-20,000 hz
What determine the speed of a wave?
the medium it is traveling through
In the Doppler Effect when does the pitch seem higher than it really is?
when the source and listener are moving closer together
In the Doppler Effect when does the pitch seem lower than it really is?
when the source and listener are moving farther apart
What is the Doppler Effect?
When the frequency appears to change when the source or listener are moving with respect to one another
What is the difference between nodes and antinodes?
nodes are point that don't appear to move, antinodes oscillate back and forth in place
What is a standing wave?
when incoming waves interfere with reflected waves to form waves that don't appear to travel from one point to the other.
When does destructive interference occur?
when the crest of one wave overlaps with the trough of another
What is destructive interference?
when two waves interfere to form a smaller/no wave
When does constructive interference occur?
when the crest of one wave overlaps with the crest of another
What is constructive interference?
when two waves interfere to form a larger wave
What is interference?
when two waves overlap and form a new wave
What type of wave is sound?
longitudinal
What type of wave is light?
transverse
What's the difference between transverse and longitudinal waves?
longitudinal waves oscillates goes side to side
transverse oscillates up and down
What equation relates wave speed, frequency, and wavelength?
v= λf
What equation relates period and frequency?
T= 1/f
What's the difference between period and frequency?
frequency is waves/time (# of waves per unit time)
period is time/wave (time for one wave)
What are the parts of a wave and their units?
amplitude (m)
fequency (hz)
wavelength (m)
wave speed (m/s)
period (s)
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