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Electromagnetic Waves
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TV remote control, thermal imaging camera, night vision camera, proximity sensors work using __________.
infrared
How can you protect yourself from harmful effects of EM waves? Name one.
Keeping distance from sources, shielding, and limiting duration of exposure.
Radar, Wi-Fi router, cellphones and microwave use _______ for them to work.
microwaves
Visible light is capable of reflecting or bouncing off of surfaces. What color of the visible spectrum is bouncing off of surface of green leaves?
green
Enumerate the 7 colors of the visible light spectrum according to increasing energy.
red, orange, yellow, green, blue, indigo, violet
EM wave often used in high speed cooking.
microwaves
Which type of EM wave is often used in radio and TV broadcasting?
radio waves
Enumerate the 7 types of waves according to decreasing frequency.
gamma, x-ray, UV, visible light, infrared, microwave, radio wave
What kind of EM wave is often used in killing bacteria or sterilization of water and medical equipments?
UV or ultraviolet
What kind of waves are used in the medical field to kill cancer cells or tumors?
gamma
What is the relationship between frequency and energy of EM waves?
directly proportional
If the frequency of EM wave increases, what will happen to its wavelength?
decrease
How can an EM wave be produced?
EM waves are produced whenever charged particles like electrons are accelerated.
Which is the only EM wave that is detectable by the human eye?
visible light
What do you call the class of EM waves with low energy and frequency which are considered harmless to living things? Give one example.
Non-ionizing radiation (radio waves, microwaves, infrared waves, visible light)
What do you call the class of EM waves with high energy and frequency which tend to become harmful to living things that are exposed to it for too long? Give one example.
Ionizing radiation (UV, X ray and Gamma rays)
Name an example of electromagnetic wave.
Any of the following: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma-rays
What property of EM wave refers to capacity of the wave to do work?
Energy
What property of EM wave refers to number of waves that pass a fixed point in a given amount of time?
Frequency
How fast do EM waves travel in an empty space or vacuum?
3.0 x 10⁸ m/s
What do you call the part of a sinusoidal wave line which refers to distance from one crest to the next crest or one trough to the next trough?
Wavelength
What do you call the part of a sinusoidal wave line which refers to the highest point of a wave?
Crest
TRUE or FALSE: All electromagnetic waves travel at the speed of light.
TRUE
TRUE or FALSE: Mechanical waves like earthquake waves can travel even without a medium.
FALSE
TRUE or FALSE: A wave is an energy created by vibrations that propagate in all direction.
TRUE
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