review session #3 waves and electricity · waves and electricity minnetonka high school | ib...
TRANSCRIPT
![Page 1: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/1.jpg)
Review Session #3Waves and ElectricityMINNETONKA HIGH SCHOOL | IB PHYSICS
![Page 2: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/2.jpg)
Simple Harmonic Motion
a -x“Acceleration is proportional to the opposite of the displacement”
![Page 3: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/3.jpg)
Dis
pla
cem
ent
Time
Vel
oci
ty
Time
Acc
eler
atio
n
Time
A
B
C
![Page 4: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/4.jpg)
_____ vs Displacement
Displacement Displacement
Velocity Acceleration
![Page 5: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/5.jpg)
Wave Equation
What is the wavelength of a 5.0 × 109 Hz microwave?
c = 3.00 × 108 m s-1
![Page 6: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/6.jpg)
Standing Waves
# of Wavelengths Wavelength (m)
1 4 m6 m
4 m
9 m
12 m
![Page 7: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/7.jpg)
Closed Pipe Resonance
L =
L =
L =
λ =
λ =
λ =
![Page 8: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/8.jpg)
Open Pipe Resonance
L =
L =
L =
λ =
λ =
λ =
![Page 9: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/9.jpg)
Calculating Frequency | Open Pipes
A open organ pipe is 2.1 m long and the speed of sound in the pipe is 341 m s-1. What is the fundamental frequency of the pipe?
![Page 10: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/10.jpg)
Electromagnetic Spectrum
![Page 11: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/11.jpg)
Try This
θ2
80°While aiming at a marble at the bottom of a fish tank filled with water (n2 = 1.33), you point so that you can measure the angle of your incident rays. What is the angle of refraction?
![Page 12: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/12.jpg)
Try This
n2 = 1
n1 = 1.52
What’s the critical angle between glass and air?
θc
![Page 13: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/13.jpg)
Wave Interference
Two speakers are separated by a distance of 5 meters, if they emit a coherent sound signal of 850 Hz. If the speed of sound is 340 m s-1, is this person in a maximum or minimum location
5 m
2.1 m
![Page 14: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/14.jpg)
Polarized Light
![Page 15: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/15.jpg)
Malus’ Law
The intensity of plane polarized light, at 30° to the vertical is I0. After passing through an analyzer at 60° to the vertical, what is the intensity measured?
![Page 16: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/16.jpg)
Try This
Label these charges as positive (+) or negative (-)
![Page 17: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/17.jpg)
Coulomb’s Law
A -5 C charge is placed 6 mm from a -5 C charge. Find the force between the two charges.
![Page 18: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/18.jpg)
Electron Drift – Try This
𝐼 = 𝑛𝐴𝑣𝑞Suppose the current in a 2.5 mm diameter copper wire is 1.5 A and there are 5.01026 free electrons per cubic meter. Find the drift velocity
Elementary Charge = 1.6 × 10-19 C
![Page 19: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/19.jpg)
Graphing Ohm’s Law
Find V and R for the resistors X and Y when the current is 2A
V
I
R
V
I
R
X
Y
![Page 20: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/20.jpg)
Kirchhoff’s First LawThe total current coming into a junction must equal the total current leaving the same junction
5 A
3 A
5 A
9 A
2 A 4 A
(+5) + (-3) + (-2) = 0 (+5) + (-9) + (+5) = 0
Σ𝐼 = 0 (𝑗𝑢𝑛𝑐𝑡𝑖𝑜𝑛)Entering Junction ● Positive
Exiting Junction ● Negative
![Page 21: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/21.jpg)
Kirchhoff’s First Law | Try This
6 A
5 A
3 A
1 A
2 A
![Page 22: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/22.jpg)
Kirkoff’s Second Law
Σ𝑉 = 0 (𝑙𝑜𝑜𝑝)
8 V
12 V
1 V9 V
12 V
Negative to Positive Positive
Positive to Negative Negative Always Negative
Over Resistors:
Across Batteries
![Page 23: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/23.jpg)
The Big Three
Ohm’s Law: If you know two of the three electrical properties: V, I, or R 𝑅 =
𝑉
𝐼
Kirchhoff’s Voltage Law Kirchhoff’s Current Law
Σ𝑉 = 0 (𝑙𝑜𝑜𝑝) Σ𝐼 = 0 (𝑗𝑢𝑛𝑐𝑡𝑖𝑜𝑛)
• Draw a loop• The voltage provided must equal
the voltage dissipated• Useful if you parallel branches to
solve for
• Calculate the current coming out of the battery (total current)
• If this splits into parallel branches, the total should still add up
![Page 24: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/24.jpg)
Combining Resistors – Try This
4 Ω
6 Ω
4 Ω 6 Ω 8 Ω
![Page 25: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/25.jpg)
Calculating Circuits - Series
R1 = 6 Ω
Vb = 12 V
I
R2 = 2 Ω Resistor V I R
R1
R2
Total
![Page 26: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/26.jpg)
Calculating Circuits - Parallel
R2 = 3 Ω
V = 12 V
R1 = 6 ΩResistor V I R
R1
R2
Total
![Page 27: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/27.jpg)
Combination Circuits - Simplify
R1 = 3 Ω
12 V
R2 = 6 Ω
R3 = 3 Ω
Resistor V I R
R1
R2
R3
Total
![Page 28: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/28.jpg)
Ammeter
Hooked up in ____________ with the component being measured
Ideal Ammeter:
[R = ]A
![Page 29: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/29.jpg)
What if Ammeter isn’t ideal?
A
10 V
What is the reading for the current flowing through the ammeter if it has an added resistance of 1 Ω?
R1 = 5 Ω R2 = 5 Ω
![Page 30: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/30.jpg)
Voltmeter
V
Hooked up in ____________ with the component being measured
Ideal Voltmeter:
[R = ]
![Page 31: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/31.jpg)
What if Voltmeter isn’t ideal?
V
R1 = 5 Ω
10 V
What is the reading for the voltmeter across R1 if it has an added resistance of 20 Ω?
R2 = 5 Ω
![Page 32: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/32.jpg)
Try This
A
12 V
R1 = 3 Ω R2 = 6.5 Ω
V
R1 = 4 Ω
12 V
R2 = 2.5 Ω
Calculate the resistance of these non-ideal meters:
AmmeterReading 1.2 A
VoltmeterReading 7 V
![Page 33: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/33.jpg)
Resistivity – Try This #2
A current of 4 A flowed through an 75 m length of metal alloy wire of area 2.4 mm2 when a p.d. of 12 V was applied across its ends. What was the resistivity of the alloy?
![Page 34: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/34.jpg)
Potential Divider | Night Light
9.0 V
A light-dependent resistor (LDR) has R = 25 Ω in bright light and R = 22,000 Ω in low light. An electronic switch will turn on a light when its p.d. is above 7.0 V. What should the value of R2 be?
R1 R2
Electronic Switch
![Page 35: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/35.jpg)
Potential Divider | Sprinkler System
9.0 V
A thermistor has a resistance of 250 Ω when it is in the heat of a fire and a resistance of 65,000 Ω in when at room temperature. An electronic switch will turn on a sprinkler system when its p.d. is above 7.0 V. What should the value of R1 be?
R1 R2
Electronic Switch
![Page 36: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/36.jpg)
Batteries | Internal Resistance
10 Ω
0.5 Ω
1.2 A
What is the emf for a battery shown below?
ε
![Page 37: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/37.jpg)
Magnetic Fields
Magnetic field lines point from _________ to _________
N S
A compass would align with these field lines
![Page 38: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/38.jpg)
Remember the Right Hand Rule?
1 2Thumb points in direction of the current
Fingers point in direction of the field lines
Thumb points in toward the North Pole of the magnet
Fingers point in direction of the current
![Page 39: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/39.jpg)
Right Hand Rule #3
Thumb points in direction of the current
Fingers point in direction of the field lines
Palm points in direction of the force
How do you represent a direction that’s perpendicular to the paper?
Into the paper Out of the paper
![Page 40: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/40.jpg)
Force on a Current Carrying Wire
A current of 3.8 A in a long wire experiences a force of 5.7 × 10-3 N when it flows through a magnetic field of strength 25 mT. If the length of wire in the field is 10 cm, what is the angle between the field and current?
![Page 41: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/41.jpg)
Force on a Moving Charge
What is the magnetic force acting on a proton (+1.6 × 10-19 C) moving at an angle of 32° across a magnetic field of 5.3 × 10-3 T at a speed of 3.4 × 105 m s-1?
![Page 42: Review Session #3 Waves and Electricity · Waves and Electricity MINNETONKA HIGH SCHOOL | IB PHYSICS ... Standing Waves # of Wavelengths Wavelength (m) 1 4 m 6 m 4 m 9 m 12 m. Closed](https://reader030.vdocuments.mx/reader030/viewer/2022040216/5f34040c159de556c266df90/html5/thumbnails/42.jpg)
Particles Moving Across Fields
magnetic field out of screen magnetic field into screen
+
+
-
-