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Flashcards in Chapter 17 Deck (25)
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________ discovered x-rays ( "x" was a variable /. )
-electrons at high speeds at metal
- energy given off e-e- -----> /metal
e-

Roentgen

1

________ discovered x-rays ( "x" was a variable /. )
-electrons at high speeds at metal
- energy given off e-e- -----> /metal
e-

Roentgen

2

ROENTGEN discovered ______ ( "x" was a variable /. )
-electrons at high speeds at metal
- energy given off e-e- -----> /metal
e-

X-rays

3

___________
- tar-like substance in mines in Czechoslovakia
- "coal tar" : used for tropical inflections
- had some "mysterious energy" as Uranium
- Marie Curie boiled down coal tar.
-discovered POLONIUM (named after Poland, her native country) and RADIUM.
- only source of Radium in the world
-won Nobel Peace prize

Marie & Pierre Curie

4

MARIE & PIERRE CURIE
- tar-like substance in mines in Czechoslovakia
- "________" : used for tropical inflections
- had some "mysterious energy" as Uranium
- Marie Curie boiled down coal tar.
-discovered POLONIUM (named after Poland, her native country) and RADIUM.
- only source of Radium in the world
-won Nobel Peace prize

Coal tar

5

MARIE & PIERRE CURIE
- tar-like substance in mines in Czechoslovakia
- "COAL TAR" :used for tropical inflections
- had some "mysterious energy" as Uranium
- Marie Curie BOILED DOWN coal tar.
-discovered _________ (named after Poland, her native country) and ______
- only source of Radium in the world
-won Nobel Peace prize

Polonium
Radium

6

How many protons does Uranium have?

92

7

________ get in the way of H2O molecules

NaCl

8

H2O is the most dense at..

4C

9

H2O is the most ______ at 4C.

dense

10

discribe a snowflake structure...

empty space; less dense ---> float

11

where does 4C water go?

sinks to the bottom

12

when does ice form?

ICE only forms when the ENTIRE LAKE is FILLED with 4C water

13

why can't Lake Tahoe freeze?

too deep

14

Salt _____ the freezing point of H20

Lowers

15

NaCl obstructs water from forming _______.

ice crystals

16

H2O cannot escape _________

vapor pressure

17

How many percent of our radiation exposure comes from NATURAL RESOURCES.

82%

18

How many percent of our radiation exposure comes from ARTIFICIAL SOURCES?

18%

19

What are the NAURAL RESOURCES that take up 82% of our radiation exposure

natural radionuclides in your body
cosmic rays
radon (gas emitted by the earth)
rocks, soil, etc

-NATURAL COSMIC RADiate ROCKS

20

how many millirems and rems do we get hit with per year?

200-400 millirems per year
0.3-0.4 rems

21

when does radiation sickness set in at?
cancer risk?

200-300 rems exposure
50% higher cancer risk

22

symptoms of radiation sickness

anemia (low RBC/WBC)
hair loss
burns
nausea
weight loss
lowered immunity
*** THE ANEMIC LOST HAIR due to BURNS & NAUSEA. she LOST WEIGHT and her IMMUNITY DROPPED

23

______: 50% chance of death within 30 days

600 rems

24

how many percent does radon take up in 82% of natural sources?

55%