A radioactive element with half-life 6.5 hrs has \[48\times {{10}^{19}}\]atoms. Number of atoms left after 26 hrs [BHU 2003]

A radioactive element with half-life 6.5 hrs has \[48\times {{10}^{19}

1.	A radioactive element with half-life 6.5 hrs has \[48\times {{10}^{19}}\]atoms. Number of atoms left after 26 hrs [BHU 2003]
A.	\[24\times {{10}^{19}}\]
B.	\[12\times {{10}^{19}}\]
C.	\[3\times {{10}^{19}}\]
D.	\[6\times {{10}^{19}}\]
Answer» D. \[6\times {{10}^{19}}\]

Discussion

No Comment Found

Related MCQs

If \[_{92}{{U}^{235}}\] nucleus absorbs a neutron and disintegrates in \[_{54}X{{e}^{139}}\], \[_{38}S{{r}^{94}}\] and X, then what will be the product X [CBSE 2002]
A radioactive nucleide X decays at the rate of \[1.00\times {{10}^{5}}\] disintegration \[{{s}^{-1}}{{g}^{-1}}\]. Radium decays at the rate of \[3.70\times {{10}^{10}}\] disintegration \[{{s}^{-1}}{{g}^{-1}}\]. The activity of X in millicuries \[{{g}^{-1}}\] \[(m\,ci\,{{g}^{-1}})\] is [MP PET 2001]
If 1 microgram of radium has disintegrated for 500 years, how many alpha particles will be emitted per second
The missing particle in the reaction, \[_{92}^{235}U+_{0}^{1}n\,\to {{\,}_{56}}B{{a}^{146}}+...+3_{0}^{1}n\] is [DPMT 2001]
Sulphur-35 (34.96903 amu) emits a \[\beta -\]particle but no \[\gamma -\]rays, the product is chlorine-35 (34.96885 amu). The maximum energy emitted by the \[\beta -\]particle is [DPMT 2004]
Oxygen contains 90% of \[{{O}^{16}}\] and 10% of \[{{O}^{18}}\]. Its atomic mass is [KCET 1998]
\[_{92}{{U}^{235}}+n\to \]fission product+neutron\[+3.20\times {{10}^{-11}}J\]. The energyreleased when \[1g\] of \[_{92}{{U}^{235}}\] undergoes fission is [CBSE PMT 1997]
A wood specimen from an archeological centre shows a \[_{6}^{14}C\] activity of 5.0 counts/min/gm of carbon. What is the age of the specimen \[({{t}_{1/2}}\]for \[_{6}^{14}C\] is 5000 years) and a freshly cut wood gives 15 counts/min/gm of carbon [AMU (Engg.) 2002]
The half-life period of \[P{{b}^{210}}\] is 22 years. If 2 gm of \[P{{b}^{210}}\] is taken, then after 11 years how much of \[P{{b}^{210}}\] will be left [KCET 2001]
The half-life period of a radioactive substance is 140 days. After how much time 15 g will decay from 16 g sample of it [AFMC 2002]

A radioactive element with half-life 6.5 hrs has \[48\times {{10}^{19}}\]atoms. Number of atoms left after 26 hrs [BHU 2003]

Discussion

No Comment Found

Related MCQs

Reply to Comment