cooking and communicating using waves Flashcards
how far do microwaves penetrate into food
1cm
what 2 materials can microwaves penetrate?
glass or plastic
what does an amount of energy depend on?
the frequency or wavelength of the wave
complete this sentence… high frequency waves
transfer more energy
explain how infrared radiation cooks food
energy is absorbed by the surface of the wood. The kinetic energy of the surface food particles increases. The rest of the food is heated by conduction
how does microwave cooking heat food?
the water or fat molecules in the outer layers of food vibrate more
complete this sentence… microwaves have wavelengths between
1mm and 30cm
complete this sentence… mobile phones use longer wavelengths than…
microwave ovens
complete this sentence… microwave radiation is used to communicate…
over long distances
complete this sentence… microwaves do not show much…
diffraction
complete this sentence… adverse weather and large areas of water can…
scatter the signals
what can mobile phones interfere with?
interfere with sensitive equipment
what do hot objects do?
emit more radiation
does infrared radiation penetrate far into food?
no
what does infrared radiation do to food?
heats the surface
