Sound
Larger vibrations produce (1) ______ sounds, and smaller vibrations produce (2) _______ sounds.
A. louder, quieter
B. quieter, louder
A. louder, quieter
What are the two different types of light sources?
Artificial sources and natural sources
Heat is thermal energy. How does it always flow?
From hot to cold.
When light passes through a medium with a different density and changes direction, it's called:
Refraction
This is the process of going from a solid to a liquid.
Melting
TRUE OR FALSE: Sound waves travel through mediums, which can be gas, liquid, or solid.
TRUE
What are the straight lines that light energy travels in called?
Rays
Give an example of a natural heat source.
Possibilities:
- The sun
- Geothermal energy from inside of the Earth
- Chemical reactions in living organisms
What is reflection?
Reflection occurs when light is not absorbed by an object, but instead bounces off of it.
This is the measurement of how closely packed together a substance's particles are.
Density
When an object vibrates, what does it produce?
Sound waves
When something is _______, it means you can not see through it and it does not allow light to pass through.
A. Transluscent
B. Transparent
C. Opaque
C. Opaque
When temperature increases (= more heat/thermal energy), what change happens to the movement of particles?
The particles will move faster.
What determines if light reflects in in the same direction or in different directions?
Whether the surface it's reflecting off of is smooth (light will reflect in the same direction) or rough (light will reflect in all directions).
What are the three properties of light?
Speed, direction, and colour
What can sound waves NOT travel through?
Vacuums (for example: space)
When light comes into contact with an object, the light is:
A. Absorbed
B. Reflected
C. Refracted
D. All of the above are possibilities!
D. All of the above are possibilities!
Name two of the three processes for how heat can cause changes to states of matter.
Possibilities:
- Melting
- Evaporation
- Expansion
How are rainbows formed?
By refraction when sunlight hits droplets of water that are in the air and bends at different angles.
What is bioluminescence? Give an example!
The process by which living organisms can produce light through a chemical reaction.
An example is fireflies.