waves - electromagnetic waves Flashcards
example of electromagnetic wave?
light
what are electromagnetic waves?
they are transverse waves that transfer energy from source to an absorbed
e.g microwave is from an oven to food
what happens when white light pass through a prism?
it splits into spectrum
what does each colour have?
a different wavelength and frequency
what is the colour spectrum?
red, orange, yellow, green, blue, indigo, violet
From red to violet what happens to wavelength? and frequency?
frequency is lower then gets higher
wavelength is longer then gets shorter
________ _____ only part of __________ spectrum that can be ________ by _____ ___
visible light, electromagnetic, detected, human eye
what is the electromagnetic spectrum order?
radio, microwave, infrared, visible light, ultra violet, x-ray, gamma rays
rich men in vegas use x-ray glasses
what happens to frequency and wavelength in electromagnetic spectrum?
frequency increases from radio - gamma and wavelength decreases
how is the electromagnetic spectrum a continuous spectrum?
cut off point between waves is not always clear
do electromagnetic waves need a medium to travel in?
no. this means they can travel through a vacuum e,g in space
how fast do waves travel in a vacuum?
at the same speed of 3 x 10 to the power of 8 m/s (3 million)
what does the absorption, transmit or reflection of electromagnetic waves on different materials depend on?
wavelength
what are light waves absorbed by? and reflected by?
black surfaces
shiny
what are microwaves reflected by? absorbed by?
metals
foods containing water molecules
