+91-87964 74404
FlagBACK
Question icon
Grade 12Inorganic Chemistry

A certain radioactive element A has a half life =t seconds.In t/2 seconds the fraction of the initial quantity of the element so far decayed is nearly

Profile image of simran kohli
12 Years agoGrade 12
Answers icon

2 Answers

Profile image of Aarti Gupta
12 Years ago
Half - life= t seconds,it means if X gm is taken initially then X/2 gm remains in t seconds.Thus in t/2 seconds,fraction decayed will be X/4 gm,or 25% will decayed.
Thanks & Regards
Aarti Gupta
askiitians Faculty
Profile image of Dharmendra soni
6 Years ago
K=0.693/t
Kt=ln(A1/A2)
(0.693/t)*t/2=ln(A1/A2)
.693/2=ln(A1/A2)
A1/A2=e^(.3465).    .....    (e^. 3465=1.414)
A2/A1=1/1.414
A2/A1=0.7072
(in %) 
70.72%(is remained) 
It means it decayed 29.28%(answer)
 
 

Other Related Questions on inorganic chemistry

question mark
Total number of structural isomers of 
[Co(NH3)6][Cr(CN)6]
inorganic chemistry
1 Answer Available

Last Activity: 3 Years ago

question mark
Why is boiling point of Cesium higher than that of Rubidium
 
inorganic chemistry
1 Answer Available

Last Activity: 3 Years ago

question mark
which isomer mentioned in (a) is water soluble and why?
inorganic chemistry
1 Answer Available

Last Activity: 3 Years ago

question mark
A gaseous mixture contains CO2 and CO the mass of the mixture is 200g and they are presenting equal fraction of moles . Find the total no. of O-atoms present in the mixture.
inorganic chemistry
1 Answer Available

Last Activity: 4 Years ago

question mark

a gaseous mixture contains O2 , N2 and He in equal fraction of moles . Find the mass of He if 28g of N is present and 32g of O is present.

inorganic chemistry
1 Answer Available

Last Activity: 4 Years ago