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Physics, Chemistry and Biology: Post your doubts here!

ZainH

ZainH

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Lost_Life

Lost_Life

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ZainH said:
Beta particles are negative, -1 in the proton number.
Meaning you ADD one proton. In the question carbon has 6 protons, so just add one.
Proton number will be 7, and of course nucleon number will increase by one as well since nucleon number = proton+neutron.
Click to expand...
no its question b ii) :p
not i)
 
Moi

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AAnsarii said:
in the QN its mentioned dat diameter is halved!!! so radius inverse of 1/2 is 2? u then square it 2 NOE THE RESISTANCE.
hope u got it.
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Oh okay..... I believe now i got it !! Thank You soooo Much !! Sorry for frustrating you ^-^
 
ZainH

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Lost_Life said:
no its question b ii) :p
not i)
Click to expand...

Oh thats easier, you know that it's half life is 5730 right? And it says recent human skeletons, meaning ones that JUST DIED have an activity of 64, but the one they dug up had an activity of 8.
So we half 64 which gives us 32, so far the skeleton is 5730 years old.
Half 32 now, and we get 16. Age is now 5730+5730
Half 16, and we finally arrive at 8! The age of the skeleton is 5730+5730+5730=17190 years old x)
 
Lost_Life

Lost_Life

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ZainH said:
Oh thats easier, you know that it's half life is 5730 right? And it says recent human skeletons, meaning ones that JUST DIED have an activity of 64, but the one they dug up had an activity of 8.
So we half 64 which gives us 32, so far the skeleton is 5730 years old.
Half 32 now, and we get 16. Age is now 5730+5730
Half 16, and we finally arrive at 8! The age of the skeleton is 5730+5730+5730=17190 years old x)
Click to expand...
OH THANKS :O
 
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