2-3 - La lumiere et la spectre electromagnetique Flashcards
l’énergie qui voyage par irradiation
énergie de rayonnement.
énergie de rayonnement.
l’énergie qui voyage par irradiationC
What’s the type of onde with longeur d’onde plus fort?
ondes radioelectriques
What photo of the sun looked blue?
The photo taken by UV rays.
What about the “blob”?
Radio rays.
Quels ondes peut traverser sous le atmosphere de earth?
ondes radioelectrique et lumiere visible.
Name the order of the spectrum.
Ondes eletromagnetiques, micro-ondes, ondes infra-rouges, lumiere visible, ondes ultraviolettes, rayons X, rayons gamma.
Why does AM have more range than FM radio?
AM has a higher longeur d’onde than the FM radio.
What’s the range of FM radio?
87.5 to 108.0 MHz (two digits)
What’s the range of AM radio?
535 to 1705 MHz (3-4 digits)
What’s the common unit for radio waves?
Mega hertz
What’s another use of ondes electro-magnetiques?
IRM.
How does IRM work?
If there’s a tumor, more water would be there and therefore more waves would be absorbed resulting in a dark patch.
Why does the microwave work?
It stimulates micro-ondes which vibrates the water molecules making the mug hot.
Why does the handle not get hot in a cup of water in a microwave?
Because it does not touch the water.
Name 4 ways to use micro-ondes.
Use them for radar, micro-waves, communication, and to predict the weather.
What do hot things do more than cold things?
Hot things produce more infrarouges ondes comparer de les choses froid.
Name 5 uses for ondes infrarouges.
Detecting the TV remote signal, lecteur de CDROM, Lamps which use infrared light can keep food warm, Dans les aéroports pour détecter les passagers qui arrivent de pays
étrangers et qui ont la fièvre, Les satellites d’observation pour observer les dommages causés par
les insectes, les maladies et les incendies aux farms ou aux forêts, perte du chaleur dans les bastiments.
What are properties of ondes ultravioletes compared to lumiere visible?
They have a longeur d’onde plus courte, energie plus eleve et frequence plus haute que la lumiere.
What absorbs a bit of the UV rays from the sun?
L’atmosphere terrestre
What’s surexposition?
Overexposure
Overexposure
surexposition
What are 2 ways to use rayons UV?
Detect fingerprints, kill bacteria.
When were rayons X discovered?
1895
What are some uses for rayons X?
To photograph teeth and bones
How do you read an rayons-X machine?
Bones completely block les rayons X, appears white. Les muscles, fluides, et lipides partially block les rayons X, appears grey. Fractures or breaks in a bone lets les rayons X completely through, appears black.
Where do gamma rays belong in the spectrum?
They belong at the end of the spectrum, with the lowest longeur d’onde, highest frequency and energy.
What are gamma rays produced from?
By nuclear reactions.
What’s a use for gamma rays?
Un faisceaux (beam or ray) of les rayons gamma can be used in radiothérapie to kill cancerous cells.
Where does TV go into the spectrum?
In between AM and FM.
