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Q. No.Let \({N_B}\) the number of \(\beta\) particles emitted by a gram of \({Na^{24}}\) radioactive nuclei (half-life \(=15\) hrs) in \(7.5\) hours, \({N_\beta}\) is close to:
(Avogadro number \(=6.023\times10^{23}/\text{g}.\) mole)
1. \(6.2\times10^{21}\)
2. \(7.5\times10^{21}\)
3. \(1.25\times10^{22}\)
4. \(1.75\times10^{22}\)
(Avogadro number \(=6.023\times10^{23}/\text{g}.\) mole)
1. \(6.2\times10^{21}\)
2. \(7.5\times10^{21}\)
3. \(1.25\times10^{22}\)
4. \(1.75\times10^{22}\)
Subtopic: Â Types of Decay |
From NCERT
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A solution containing active cobalt \(\frac{60}{27}~\text{Co}\) having activity of \(0.8 \mu~ \text {Ci} \) and decay constant \(\lambda \) is injected into an animal's body. If \(1~ \text{cm}^3\) of blood is drawn from the animal's body after \(10 ~\text{hr}\) of injection, the activity found was \(300\) decays per minute. What is the volume of blood that is flowing in the body?
(\(1~\text{Ci} = 3.7 \times 10^{10} \) decays per second and at \(t = 10 ~\text{hr},~~~ e^{-\lambda t} = 0.84 )\)
1. \(4 ~\text{liters}\)
2. \(6 ~\text{liters} \)
3. \(5 ~\text{liters}\)
4. \(7 ~\text{liters}\)
(\(1~\text{Ci} = 3.7 \times 10^{10} \) decays per second and at \(t = 10 ~\text{hr},~~~ e^{-\lambda t} = 0.84 )\)
1. \(4 ~\text{liters}\)
2. \(6 ~\text{liters} \)
3. \(5 ~\text{liters}\)
4. \(7 ~\text{liters}\)
Subtopic: Â Types of Decay |
JEE
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How many alpha and beta particles are emitted when Uranium \(_{92} U^{238}\) decays to lead \(_{82} Pb^{206}\)?
1. 3 alpha particles and 5 beta particles
2. 6 alpha particles and 4 beta particles
3. 4 alpha particles and 5 beta particles
4. 8 alpha particles and 6 beta particles
1. 3 alpha particles and 5 beta particles
2. 6 alpha particles and 4 beta particles
3. 4 alpha particles and 5 beta particles
4. 8 alpha particles and 6 beta particles
Subtopic: Â Types of Decay |
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From NCERT
JEE
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In the following nuclear reaction,
Mass number of D is 182 and atomic number is 74. Mass number and atomic number of D4 respectively will be:
1. 174 and 71
2. 174 and 69
3. 172 and 69
4. 172 and 71
Mass number of D is 182 and atomic number is 74. Mass number and atomic number of D4 respectively will be:
1. 174 and 71
2. 174 and 69
3. 172 and 69
4. 172 and 71
Subtopic: Â Types of Decay |
 83%
From NCERT
JEE
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