問題一覧
1
Father of EM Theory. He also proposed that electrical and magnetic fields can couple together to form EM waves
James Clerk Maxwell
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A German physicist who applied Maxwell's theories to the production and reception of radio waves
Heinrich Hertz
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Father of Electromagnetic induction
Michael Faraday
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He made a revolutionary discovery that a wire carrying electrical current can attract or repel another wire
Andre-Marie Ampère
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He discovered that electric current in a wire can deflect a magnetized compass needle
Hans Christian Oersted
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If you put two same wires, they will and if you put two opposite wires, they will
Repel, Attract
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EM waves do not need ___ to travel
Medium
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What kind of wave travels far
Radiowaves
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Radio waves travel far in a ___
Vacuum
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Which of the following is not an example of a mechanical wave?
Light wave
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EM waves propagate of about ___
300,000,000 meters per second
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EM waves are ___
Transverse waves
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EM spectrum are __
The range of all types of radiation
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What EM wave has the lowest frequency
Radiowaves
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What EM wave has the highest frequency
Gamma rays
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Radiowaves are emitted by
The stars and gases in the space
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Microwaves are used by
Astronomers to learn about the structure of nearby galaxies
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Infrared lights are emitted by
Our skin and objects with heat
19
Visible lights are an example of
Light bulbs, fireflies, and etc
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UV rays are emitted by
The sun that makes our skin tan or burn
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X-rays are
Used by your dentist to image your teeth and airport securities to look through your bag
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Gamma rays are
Used by doctors to image your body
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Wavelength are the
Distance traveled by a wave
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Frequency are the
Intensity/energy carried by a wave
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Decreased in wavelength
Radio is longer than Gamma
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Increased in frequency
Gamma is louder than Radio
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Longer wavelength =
Lower frequency
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Lower frequency =
Harmless
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Shorter wavelength =
Higher frequency
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Higher frequency =
Harmful
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EM radiation can be expressed in terms of..
Energy, Wavelength, and Frequency
32
Frequency are measured by
Cycle per second (hertz)
33
Wavelength are measured in
Meters
34
Speed of light
3.0 x 10⁸ m/s
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Electromagnetic wave radiation's effects depend on how much ___ an EM wave carries and the ___ of exposure to it
Energy, Frequency
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The process of emitting energy by either particles or waves
Radiation
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Sources of radiation
Manmade and Natural
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Two types of radiation
Ionizing Radiation and Non-ionizing Radiation
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A type of radiation that may cause severe damage in living organisms
Ionizing Radiation
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3 examples of ionizing radiation
UV rays, X-rays, and Gamma rays
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A type of radiation which causes less damage to living organisms
Non-ionizing Radiation
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4 examples of non-ionizing radiation
Radiowaves, Microwaves, Infrared rays, and Visible lights
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3 effective ways to protect yourself against radiation
Limit your exposure, Distance yourself from the source, and Use shieldings if possible
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The highest point of a wave
Crest
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The lowest point of a wave
Trough
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EM waves are arranged in EM spectrum based on ___
Their wavelength and frequency
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EM waves propagate in what direction
Perpendicular to electric and magnetic field direction
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What changes to EM waves that makes the electric fields change its speed too
Acceleration
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What property do we look when we are solving EM waves
Wavelength