lesson 2
what type of wave is most harmful?
Gamma rays
define electromagnetic wave
a wave that can travel through empty space and through matter
what are two outcomes to change the way a carrier wave caries information
amplitude-modulated wave or frequency-modulated wave
what are the two types of waves
mechanical and electromagnetic
what is the use of the outer ear?
to move the sound waves through the ear canal
what wave is a high-energy electromagnetic wave that has a slightly shorter wave length and higher frequency than a ultraviolet wave?
X-ray
list the percentages of the suns light
ultraviolet-7% infrared-49% light-44%
how does a radio antenna work
the antenna detects a wave with the frequency you choose , the radio pushes the electric charge in the antenna producing an electric current
what is one use for ultraviolet light in the medical field
staralization of instruments
what is a decible
the unit that measures sound intensity
name 3 types of waves
radio wave, microwave, infrared wave, light, ultraviolet wave, x-ray, gamma ray
what is the formula for calculating wave speed
speed=frequency times wavelength
What is a carrier wave?
An electromagnetic wave that a radio or television station uses to carry its sound or image signals
what are 2 uses of a microwave
cell phone, cook food,
what is a cornea's job
it protects the eye
list 3 details about a radio wave
low-frequency, low-energy, longer than 30 cm
list 3 items that are hot enough to produce electromagnetic waves
campfire, light bulbs, burner on electric stove, heater
what is the global positioning system used for?
to locate the reciever
what is the frequency of a x-ray
high
what does translusent mean
list the electromagnetic spectrum in order from lowest frequency and lowest energy to highest frequency and highest frequency.
radio wave, microwave, infrared wave, light, ultraviolet wave, X-ray, gamma ray. (in the order)
whats a supernova
a exploding star
what are two side effects of ultraviolet light?
can cause cancer and sun burns
whats refraction
the change in the waves direction