# Kinetic energy question

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#1
Hi,

I'm having trouble understanding why the answer to the following question is D.

Is the kinetic energy not proportional to the mass of the object, so should it not be 4E/238 as the mass of the alpha particle is 4?

Any help is appreciated, thank you.
1
1 month ago
#2
is this an a level q?

KE is proproational to the mass
mass of Th is 234, and mass of alpha particle is 4
so ratio is 234:4 = 238 of E
so 4 = 234/238 of E
so thereofre the answer is D?????

is that even correct lmao sorry if this got u the wrong answer ahah im onlyin year 12 and we haven't even done this in a level phsyics yet

lmk if D is acc the right answer
Last edited by vix.xvi; 1 month ago
0
#3
(Original post by vix.xvi)
is this an a level q?

KE is proproational to the mass
mass of Th is 234, and mass of alpha particle is 4
so ratio is 234:4 = 238 of E
so 4 = 234/238 of E
so thereofre the answer is D?????

is that even correct lmao sorry if this got u the wrong answer ahah im onlyin year 12 and we haven't even done this in a level phsyics yet

lmk if D is acc the right answer
I'm a bit confused on the bit "so 4 = 234/238 of E" why is it 234/238? is the proportion of kinetic energy shared not 4/238 since the mass is 4?
0
1 month ago
#4
(Original post by Navboi)
I'm a bit confused on the bit "so 4 = 234/238 of E" why is it 234/238? is the proportion of kinetic energy shared not 4/238 since the mass is 4?
yeah that's the PROPORPTION
so to write it as a fraction that's 4/238

eg if u have a ratio of x:y, x is x/(x+y)
make sense?

btw is my answer acc correct lol it may be wrong
0
#5
(Original post by vix.xvi)
yeah that's the PROPORPTION
so to write it as a fraction that's 4/238

eg if u have a ratio of x:y, x is x/(x+y)
make sense?

btw is my answer acc correct lol it may be wrong
yes I understand this, but you used 234/238 instead of 4/238 which is the thing that has me confused. But don't worry about it, I'm sure someone else can explain it since you have not covered this in class.
0
1 month ago
#6
(Original post by Navboi)
yes I understand this, but you used 234/238 instead of 4/238 which is the thing that has me confused. But don't worry about it, I'm sure someone else can explain it since you have not covered this in class.
ohh i get what ur trying to say, idk myself why its not 4/238 if i think about it...
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