2-3 - La lumiere et la spectre electromagnetique

Question 1

l’énergie qui voyage par irradiation

Answer 1

énergie de rayonnement.

Question 2

énergie de rayonnement.

Answer 2

l’énergie qui voyage par irradiationC

Question 3

What’s the type of onde with longeur d’onde plus fort?

Answer 3

ondes radioelectriques

Question 4

What photo of the sun looked blue?

Answer 4

The photo taken by UV rays.

Question 5

What about the “blob”?

Answer 5

Radio rays.

Question 6

Quels ondes peut traverser sous le atmosphere de earth?

Answer 6

ondes radioelectrique et lumiere visible.

Question 7

Name the order of the spectrum.

Answer 7

Ondes eletromagnetiques, micro-ondes, ondes infra-rouges, lumiere visible, ondes ultraviolettes, rayons X, rayons gamma.

Question 8

Why does AM have more range than FM radio?

Answer 8

AM has a higher longeur d’onde than the FM radio.

Question 9

What’s the range of FM radio?

Answer 9

87.5 to 108.0 MHz (two digits)

Question 10

What’s the range of AM radio?

Answer 10

535 to 1705 MHz (3-4 digits)

Question 11

What’s the common unit for radio waves?

Answer 11

Mega hertz

Question 12

What’s another use of ondes electro-magnetiques?

Answer 12

IRM.

Question 13

How does IRM work?

Answer 13

If there’s a tumor, more water would be there and therefore more waves would be absorbed resulting in a dark patch.

Question 14

Why does the microwave work?

Answer 14

It stimulates micro-ondes which vibrates the water molecules making the mug hot.

Question 15

Why does the handle not get hot in a cup of water in a microwave?

Answer 15

Because it does not touch the water.

Question 16

Name 4 ways to use micro-ondes.

Answer 16

Use them for radar, micro-waves, communication, and to predict the weather.

Question 17

What do hot things do more than cold things?

Answer 17

Hot things produce more infrarouges ondes comparer de les choses froid.

Question 18

Name 5 uses for ondes infrarouges.

Answer 18

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.

Question 19

What are properties of ondes ultravioletes compared to lumiere visible?

Answer 19

They have a longeur d’onde plus courte, energie plus eleve et frequence plus haute que la lumiere.

Question 20

What absorbs a bit of the UV rays from the sun?

Answer 20

L’atmosphere terrestre

Question 21

What’s surexposition?

Answer 21

Overexposure

Question 22

Overexposure

Answer 22

surexposition

Question 23

What are 2 ways to use rayons UV?

Answer 23

Detect fingerprints, kill bacteria.

Question 24

When were rayons X discovered?

Answer 24

1895

Question 25

What are some uses for rayons X?

Answer 25

To photograph teeth and bones

Question 26

How do you read an rayons-X machine?

Answer 26

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.

Question 27

Where do gamma rays belong in the spectrum?

Answer 27

They belong at the end of the spectrum, with the lowest longeur d’onde, highest frequency and energy.

Question 28

What are gamma rays produced from?

Answer 28

By nuclear reactions.

Question 29

What’s a use for gamma rays?

Answer 29

Un faisceaux (beam or ray) of les rayons gamma can be used in radiothérapie to kill cancerous cells.

Question 30

Where does TV go into the spectrum?

Answer 30

In between AM and FM.