Physics Flashcards
How can heat be transferred from place to place?
Conduction, convection and radiation.
All objects emit (give out) and absorb (take in) thermal radiation, which is also called _______.
Infrared radiation.
What does the kinetic particle theory explain?
The kinetic particle theory explains the properties of the different states of matter.
What are the arrangements and movements of:
Solids, liquids and gases
Solids: Closer together in a regular pattern, vibrate about a fixed position.
Liquids: Close together and random, move around each other.
Gases: Far apart and random, move quickly in any direction.
What are poor conductors of heat called?
Insulators.
The hotter the energy, _____________
The more kinetic energy these vibrations have.
How are sound waves created?
Sound waves are created whenever an object vibrates. When you talk, your vocal chords vibrate.
How do they travel? What type of wave?
The vibrations make the air around the object vibrate, and travel through the air as a sound wave. Sound waves are longitudinal waves.
What can sound waves travel through?
Sound cannot travel through a vacuum as there are no particles in the vacuum to vibrate. An example of a vacuum is space.
Which material can sound waves travel through? Why?
They travel fastest through metals such as steel at 5000 m/s because the material is denser than others, and so allows the sound to travel faster.
How could you show a sound wave on a slinky?
If you shake a slinky up and down or sideways with both ends, the slinky starts to show moving waves which represent the sound waves (both longitudinal and transverse).
What is a wavelength?
The shortest distance between two coherent points on the same wave. E.g. The distance from peak to peak.
What is amplitude?
Maximum height of the wave measured from the middle.
What is frequency?
The number of waves passing through a point each second.
