Heat/Sound/Light Test 2023 Flashcards
What is energy transfer?
The process by which energy is relocated from one system to another.
What is conduction?
Conduction is the process where heat is transferred from a hotter object to a colder object
What things conduct heat and electricity the best?
Metallic solids (as particles are closer together), metals (steel, copper).
What is convection?
Movement in a liquid due to the heating and cooling process. Creates convection currents
What are convection currents?
Convection currents are heat-driven cycles in the fluids. As water closer to a heat source gets hotter, it rises to the top. Cooler water sinks back down. This rising and sinking cycle creates movement e.g. boiling.
What are insulators?
Things that hold in heat well - they do not transfer heat easily.
List 5 conductors
Copper, steel, iron, bronze, silver,
List 5 insulators
Glass, wool, wood, fibreglass, ceramics, styrofoam, plastic, rubber
What is the direction of heat transfer?
Heat transfers only in the direction of objects that are colder. The difference in temperature determines the direction.
What is a wavelength?
Distance between wave’s crests
What type of wave does sound travel in?
Longitudinal
What is frequency?
Frequency, or pitch, is the number of times a sound wave repeats itself. Many waves produce a higher pitch whilst fewer waves produce a lower pitch. Shorter the wavelength, higher the pitch.
What is amplitude?
The strength of a sound/volume or loudness. It is measured in decibels (dB). Demonstrated by height of the crest
What are compressions?
A region in a longitudinal wave where particles are the most compressed (usually top of wave)
What are rarefactions?
Particles in the wave become more spread out at the trough of the wave - a decrease in the density of the matter (eg. air) around the wave as it travels through
