Energy
Heat Transfer
Sound vs Light Waves
Electromagnetic Waves
Frequency & Amplitude
100
Energy of Motion
What is Kinetic Energy?
100
Heat transfer between objects that are touching.
What is Conduction?
100
Light is ___________, which means it doesn’t require a medium (light can travel through empty space).
Light is an Electromagnetic Wave.
100
Which type of electromagnetic wave has the most energy?
Gamma Rays since they have the shortest wavelengths.
100
How does the sound change when the amplitude changes?
As the amplitude increases, the sound gets louder. As the amplitude decreases, the sound gets quieter.
200
Stored Energy
What is Potential Energy?
200
The flow of a fluid or gas where it rises when it becomes warmer and less dense, and sinks when it becomes colder and more dense.
What is Convection?
200
What kind of waves are sound waves?
Longitudinal Waves
200
What is the relationship between wavelength and wave energy?
The relationship between wavelength and wave energy is that as wavelength decreases, energy increases.
200
How does the sound change when the frequency changes?
As the frequency increases, the sound becomes higher pitch. As the frequency decreases, the sound becomes lower pitch.
300
Heat, Light, and Sound are examples of this kind of energy.
What is Kinetic Energy?
300
The transmission of heat through electromagnetic waves.
What is Radiation?
300
What are the color light waves IN ORDER from the least energy to most energy?
300
Why are sound waves not shown in the diagram?
Sound waves are mechanical waves, while this diagram only shows electromagnetic waves.
300
How does the light change when the amplitude changes?
As the amplitude increases the light gets brighter. As the amplitude decreases the light gets dimmer.
400
Chemical energy and Nuclear energy are examples of this kind of energy.
What is potential energy?
400
The materials in a lava lamp are usually water and wax. Use the diagram above and your knowledge of convection to explain how a lava lamp works. What makes the wax float? What makes it sink? Use and box the terms heat and density in your answer.
A lava lamp works because convection occurs when the wax is heated. The wax at the bottom is heated and melts. It becomes less dense when it is heated by the bulb at the bottom and that makes it rise. Then it cools off at the top, which makes it more dense and makes it sink back down. Then it heats back up and the cycle starts over again.
400
Explain why a black car would get hotter than a white car when they both sit out on a sunny summer day. Use the word energy in your answer.
A black car gets hot in the sun because it absorbs all colors of light, and that light energy turns into thermal energy (heat). A white car is reflects all the sunlight.
400
How do Microwave ovens work?
Microwave ovens work by using microwaves about 12 centimeters in length to force the water and fat molecules in food to rotate. The interaction of these molecules undergoing forced rotation creates heat, and the food is cooked.
400
How does the light change when the frequency changes?
As the frequency changes the color changes (low frequency = red, high frequency = violet)
500
How did the car get the energy it had at point X?
The potential energy from point w transformed into kinetic energy at point x.
500
When the police are tracking a fugitive (a runaway criminal), they often use helicopters with infrared cameras that can detect heat waves that are emitted by the criminal’s body. Is this an example of convection, conduction or radiation?
Radiation
This is an example of radiation because the police are looking at heat waves. Heat that travels as a wave is radiation. They don’t feel the heat by touching the person (conduction) or through the air (convection).
500
Explain why the apparent position of the fish is different than the actual position of the fish. What is happening to the light from the fish?
The fish appears to be in a different position than it actually is because when the light waves pass through the water from the fish to the man’s eyes they are bent. This is an example of refraction.
500
What type of electromagnetic radiation is this wave? How do you know?
It is probably a type of radio wave because it has a wavelength of 500m. 500m is close to 1,000m, which is the size of radio waves.
500
All airplanes have red lights on their left wings and green lights on their right wings. The lights are different colors, but they have the same brightness.
1. What must be the same about the waves of both lights? Why?
2. What must be different about the waves of the two lights? Why? Be as specific as possible in your answer.
Because they’re the same brightness they must have the same amplitudes.
Because they’re different colors they must have different frequencies.
(Bonus points to scholars who point out that the red light has a lower frequency than the green light.)