Heat Transfer Basics
What are the three methods of heat transfer?
conduction, convection, radiation
Which method of heat is used in frying pans?
conduction
What type of wave is sound?
longitudinal wave
What is pitch related to in a sound wave?
frequency
Why do black clothes feel hotter in the sun?
they absorb more radiant heat
In which state of matter does conduction happen best?
solids
boiling water - hot water rises, cool water sinks.
What does sound need to travel?
a medium (solid, liquid, or gas)
What is loudness related to in a sound wave?
amplitude
What kitchen appliance uses radiation to heat food?
microwave
What is required for convection to occur?
A fluid (liquid or gas) and temperature differences.
How does a vacuum flask reduce heat loss?
by minimising conduction, convection, and radiation
What happens to sound when it travels through a denser medium?
What happens to the pitch of a sound as the frequency increases?
the pitch becomes higher
Why do your ears pop on a plane?
change in air pressure affects your eardrum
Which method of heat transfer involves electromagnetic waves?
Why are house ceilings insulated with reflective materials?
What part of the ear vibrates first when sound enters?
the eardrum
What part of a sound wave determines how loud it sounds?
they trap air, reducing convection
Why do metals feel cold to the touch even if they're at room temperature?
they conduct heat away from your hand quickly
Why can't convection occur in space?
there are no particles (it's a vacuum)
Why can't sound be heard in space?
space is a vacuum - no particles to carry sound
How do echoes form?
sound reflects off a surface and returns
What is the function of the cochlea in the ear?
converts sound vibrations into electrical signals for the brain