Knowledge Check

3.3 Knowledge Check

1

Knowledge Check: Part A

The lasers are made from stacking light waves that add together into a larger wave in a process known as ______________.

3 Points

destructive interference

constructive interference

radio interference

gamma ray interference

2

The light waves have that particular interference from questions #1 because they are emitted __________.

3 Points

in phase

out of phase

in perpendicular directions

in thoughtless rage

3

The emission of the light waves in the lasers allows them to overlap properly to create larger waves, which means that _______________________ overlap. 

3 Points

the waves do not

the troughs of one wave and the crests of another

identical parts of the two waves

only fifty percent of one wave and another wave

4

The lasers are red, meaning that they are giving off light in the ____________ region of the electromagnetic spectrum.

3 Points

radio wave

microwave

visible light wave

ultraviolet wave

5

The weapon used by the Jawa surrounds R2-D2 with a strong electric field, which is created by a large imbalance of ____________.

3 Points

electrons

chemical bonds

neutrons

the Force

6

The electric field induces the flow of electrons, known as __________________,

3 Points

voltage

electric current

resistance

interference

7

The magnitude of the electric current is directly proportional to the _____________ of the electric field.

3 Points

voltage

electric current

resistance

interference

8

The magnitude of the electric current is inversely proportional to the _______________ of the circuits in R2D2.

3 Points

voltage

electric current

resistance

interference

9

The setting sun is actually visible after it has dropped below the horizon due to the bending of light waves entering the atmosphere at a non-perpendicular angle to the surface, a process known as _______________.

3 Points

reflection

refraction

constructive interference

destrustive interference

10

The Sun is going down, and most of the land is dark, still we can see silhouettes and outlines of objects because some light is still ____________ the atmosphere.

3 Points

absorbed in

reflected by

transmitted through

scattered by

11

Obi Wan uses his Jedi mind tricks to compel people to do his will. The words he uses begin in his vocal cords which _________ the air molecules in his throat.

3 Points

reflect

refract

absorb

vibrate

12

The words that began in his vocal chords are passed in _____________ through the gas medium to convince the troopers.

sound waves

radio waves

microwaves

visible light waves

13

Han and Greedo fire their blasters at each other. The blasts are loud, and the intensity of the sound spreads through the cantina following the ______________.

3 Points

Conservation of Momentum

Inverse Square Law

Ohm’s Law

Newton’s Third Law of Momentum

14

The sound strikes the cantina walls and bounces off at the same angle as it struck in a process known as ______________.

3 Points

reflection

refraction

constructive interference

destructive interference

15

Obi Wan hears the destruction of a planet and all of its people through ‘the force’. These sounds are only in his head and are not carried through space, since space has no ______________ through which sound could transmit.

3 Points

electromagnetic wave

electrons

magnetic field

medium

16

However, had it been a real sound, the sound’s pitch would have been increased by the Doppler Effect, since the Falcon was moving ______________ the source of the sound.

3 Points

perpendicular to

away from

towards

at the same speed as

17

The communications of the ship were made inoperable by electromagnetic waves sent by the Death Star that were completely out of phase with attempted communications causing ______________.

3 Points

reflection

refraction

constructive interference

destructive interference

18

These generators utilize a changing magnetic field through coils of wire to produce ______________ that supplies the tractor beam with electricity.

3 Points

an electric field

a Doppler effect

constructive interference

destructive interference

19

Vader’s light saber is red, while Obi-Wan’s light saber is blue, meaning that Obi-Wan’s light saber is emitting ______________ compared to Vader’s light saber.

3 Points

lower energy light waves

higher energy light waves

the same energy light waves

more sound waves

20

Both red and blue light are in the visible light region of ______________.

3 Points

Ohm’s Law

the Inverse Square Law

the electromagnetic spectrum

Newton’s Third Law of Motion

21

Knowledge Check: Part B

Find a picture from a media source (movies, TV, comics, video games, etc.) that contains a device generating electricity connected to a device that is using electrical energy.  Place the picture in the following diagram template and cite the image using APA format:

Keynote: Week3DiagramTemplate.key

PowerPoint: Week3DiagramTemplate.pptx

If you need help learning how to manipulate the template in Keynote checkout this Lynda.com video series . For a different version of Keynote, power point or other software, just search in lynda.com for other great courses.

If you are unable to open either of the diagram templates for any reason, please use the image below as a guideline in creating your own diagram in another presentation-based software program.

Answer the following questions based on the picture chosen and what you have learned this week.

Open your diagram template and do the following:

1. Move and resize the red circle so that it is around an object in your diagram that is producing electricity (electrical energy) and label it in the key.

2. Move and resize the green circle so that it is around the device that is using electrical energy and label it in the key.

0 Points

Done!

Do not choose this option.

22

Current is most closely defined as:

3 Points

The amount of electrical potential energy between two charged points per unit of charge.

A quantity that measures the amount of opposition to electron flow in a circuit.

The rate at which electric charge is flowing through a conductor.

Both A and C.

None of the above.

23

Voltage is most closely defined as:

3 Points

The amount of electrical potential energy between two charged points per unit of charge.

A quantity that measures the amount of opposition to electron flow in a circuit.

The rate at which electrons are flowing around a closed circuit per unit of time.

Both A and C.

None of the above.

24

Resistance is most closely defined as:

3 Points

The amount of electrical potential energy between two charged points per unit of charge.

A quantity that measures the amount of opposition to electron flow in a circuit.

The rate at which electrons are flowing around a closed circuit per unit of time.

Both A and C.

None of the above.

25

The electrical energy from the electric generator is being sent to the device that uses that electrical energy. Does this energy vanish? If not, what happens to this energy after it makes it to the device? (Don’t forget about the Conservation of Energy!)

5 Points

26

If the cable from the electrical generator was looped on the floor producing a coil and turned on what would happen?

3 Points

An electric field would be produced in the center of the coil.

A magnetic field would be produced in the center of the coil.

Light would be produced in the center of the coil.

Nothing would happen.

27

 Suppose another device was wired into the circuit next to your current device using electrical energy that you circled in green before.  Assuming this second device was wired in series, what would happen to the total current?

3 Points

The current would go up.

The current would go down.

The current stays the same.

28

Open your diagram template and do the following:

1. In order for current to flow, there must be a complete circuit (loop) for the current to flow through. Move, resize, and rotate the yellow arrows to show the full circuit between the generator and the electrical using device that the current is using. You can also copy and paste to make more arrows if needed. (Make your best guess if you are not able to see all the wires.)

2. You will be marking the voltage at two points on your circuit that you have marked with yellow arrows. A orange dot will mark a point with the higher voltage, and a purple dot will mark a point with lower voltage. Place one of the two dots either right before or right after the power generator in your circuit. Place the other dot on your circuit near the device using electric power.

Save your diagram as a PDF and upload the completed file below.

20 Points

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Knowledge Check was first posted on July 12, 2019 at 1:25 pm.

 

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