Question

B

Answer 1

good

Answer 2

C

Answer 3

good guess but inside the nucleus the electrostatic force is weaker or otherwise the nucleus would fly apart

also the electrostatic force can apply over long distances not just short distances

Answer 4

B

Answer 5

gonna say A because electrostatic force is a long range force while nuclear strong force is only a short range force

Answer 6

A

Answer 7

awesome

Answer 8

so if 25% of the original amount of C-14 is still left how many half lives have passed?

Answer 9

1432.5

Answer 10

that's not quite it ^^ remember that 25% is the amount of material left, not the time, so taking 25% of the half life isn't meaningful information

start with 100%, how many divisions by 2 does it take to get to 25%?

Answer 11

4

Answer 12

good attempt but

100% --> divide by 2 --> 50% --> divide by 2 again --> 25%

so only two half lives have passed, giving us the age...?

Answer 13

B

Answer 14

good

Answer 15

b

Answer 16

hm. keep in mind the question is asking about their lengths not their speeds.

Answer 17

D

Answer 18

object length contracts near the speed of light, so C

Answer 19

momentum

Answer 20

A+ good

Answer 21

Either B or C :/

Answer 22

well, the universe is expanding so are galaxies moving away or towards us?

Answer 23

towards

Answer 24

has to be away, if they were moving towards us the universe would be getting smaller/contracting

so B

Answer 25

Oh okay :/

Answer 26

Um A

Answer 27

i mean D too i guess

Answer 28

good attempt but "educated guess" is understating the amount of evidence we have for the big bang

the big thing is that it doesn't state what caused it, so D is a better choice

Answer 29

hm. the key is ~quantum~ which states that photons can only be emitted at specific quanta, or discrete amounts of energy.

Answer 30

" a few possible energies" best corresponds to the idea of discrete energy

so C

Answer 31

C

Answer 32

I mean D

Answer 33

during the early moments there were only light elements formed

so out of those 4 choices which one has the lowest molar mass?

Answer 34

A

Answer 35

helium has a lower MM (it's atomic #2) so helium is the better answer

Answer 36

A

Answer 37

good

Answer 38

its goes alpha beta and gamma right?

Answer 39

yes

Answer 40

SO A

Answer 41

oh, not quite

in terms of penetrating power alpha is less than beta, beta less than gamma

Answer 42

B

Answer 43

well done

Answer 44

Not sure about this one

Answer 45

generally fusion produces less waste than fission

Answer 46

C

Answer 47

good