NEET Test Series from KOTA - 10 Papers In MS WORD
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NUCLEAR PHYSICS
147751
The operation of a nuclear reactor is said to be critical, if the multiplication factor $(k)$ has a value
1 1
2 1.5
3 2.1
4 2.5
Explanation:
A The operation of a nuclear reactor is said to be critical if the multiplication factor $(\mathrm{k})$ has a value 1 . The multiplication factor is $\mathrm{k}=\frac{\text { rate or production of neutrons }}{\text { rate of loss of neutrons }}$ If, $\quad \mathrm{k}>1$ explosions occurs If, $\quad \mathrm{k} \lt 1$ the chain reaction comes to half.
UP CPMT-2006
NUCLEAR PHYSICS
147742
The SI unit of radioactivity is :
1 Rutherford
2 Roentgen
3 Becquerel
4 Curie
Explanation:
C The SI unit of radioactivity is Becquerel (Bq).
Karnataka CET-2002
NUCLEAR PHYSICS
147763
If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?
1 Alpha rays
2 Beta rays
3 Gamma rays
4 All have same wavelength
Explanation:
D de-Broglie wavelength associated with matter is given by, $\lambda=\frac{h}{p}$ Where, $\mathrm{p}=$ momentum Since, alpha, beta and gamma rays carry same momentum. So all these have same wavelength.
JIPMER-2008
NUCLEAR PHYSICS
147767
The half-life of $\mathrm{Ra}^{226}$ is 1620 years. Then the number of atoms decay in one second in $1 \mathrm{~g}$ of radium (Avogadro number $=\mathbf{6 . 0 2 3} \times \mathbf{1 0}^{\mathbf{2 3}}$ )
1 $4.23 \times 10^{9}$
2 $3.16 \times 10^{10}$
3 $3.61 \times 10^{10}$
4 $2.16 \times 10^{10}$
Explanation:
C Given, half life $\left(\mathrm{t}_{1 / 2}\right)=1620$ years $\therefore \quad \frac{\mathrm{dN}}{\mathrm{dt}}=\lambda \mathrm{N}$ $=\frac{\ln 2}{\mathrm{t}_{1 / 2}} \times \mathrm{N}$ $=\frac{0.6932}{1620 \times 365 \times 86400} \times \frac{6.023 \times 10^{23}}{226}$ $=3.61 \times 10^{10}$
147751
The operation of a nuclear reactor is said to be critical, if the multiplication factor $(k)$ has a value
1 1
2 1.5
3 2.1
4 2.5
Explanation:
A The operation of a nuclear reactor is said to be critical if the multiplication factor $(\mathrm{k})$ has a value 1 . The multiplication factor is $\mathrm{k}=\frac{\text { rate or production of neutrons }}{\text { rate of loss of neutrons }}$ If, $\quad \mathrm{k}>1$ explosions occurs If, $\quad \mathrm{k} \lt 1$ the chain reaction comes to half.
UP CPMT-2006
NUCLEAR PHYSICS
147742
The SI unit of radioactivity is :
1 Rutherford
2 Roentgen
3 Becquerel
4 Curie
Explanation:
C The SI unit of radioactivity is Becquerel (Bq).
Karnataka CET-2002
NUCLEAR PHYSICS
147763
If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?
1 Alpha rays
2 Beta rays
3 Gamma rays
4 All have same wavelength
Explanation:
D de-Broglie wavelength associated with matter is given by, $\lambda=\frac{h}{p}$ Where, $\mathrm{p}=$ momentum Since, alpha, beta and gamma rays carry same momentum. So all these have same wavelength.
JIPMER-2008
NUCLEAR PHYSICS
147767
The half-life of $\mathrm{Ra}^{226}$ is 1620 years. Then the number of atoms decay in one second in $1 \mathrm{~g}$ of radium (Avogadro number $=\mathbf{6 . 0 2 3} \times \mathbf{1 0}^{\mathbf{2 3}}$ )
1 $4.23 \times 10^{9}$
2 $3.16 \times 10^{10}$
3 $3.61 \times 10^{10}$
4 $2.16 \times 10^{10}$
Explanation:
C Given, half life $\left(\mathrm{t}_{1 / 2}\right)=1620$ years $\therefore \quad \frac{\mathrm{dN}}{\mathrm{dt}}=\lambda \mathrm{N}$ $=\frac{\ln 2}{\mathrm{t}_{1 / 2}} \times \mathrm{N}$ $=\frac{0.6932}{1620 \times 365 \times 86400} \times \frac{6.023 \times 10^{23}}{226}$ $=3.61 \times 10^{10}$
147751
The operation of a nuclear reactor is said to be critical, if the multiplication factor $(k)$ has a value
1 1
2 1.5
3 2.1
4 2.5
Explanation:
A The operation of a nuclear reactor is said to be critical if the multiplication factor $(\mathrm{k})$ has a value 1 . The multiplication factor is $\mathrm{k}=\frac{\text { rate or production of neutrons }}{\text { rate of loss of neutrons }}$ If, $\quad \mathrm{k}>1$ explosions occurs If, $\quad \mathrm{k} \lt 1$ the chain reaction comes to half.
UP CPMT-2006
NUCLEAR PHYSICS
147742
The SI unit of radioactivity is :
1 Rutherford
2 Roentgen
3 Becquerel
4 Curie
Explanation:
C The SI unit of radioactivity is Becquerel (Bq).
Karnataka CET-2002
NUCLEAR PHYSICS
147763
If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?
1 Alpha rays
2 Beta rays
3 Gamma rays
4 All have same wavelength
Explanation:
D de-Broglie wavelength associated with matter is given by, $\lambda=\frac{h}{p}$ Where, $\mathrm{p}=$ momentum Since, alpha, beta and gamma rays carry same momentum. So all these have same wavelength.
JIPMER-2008
NUCLEAR PHYSICS
147767
The half-life of $\mathrm{Ra}^{226}$ is 1620 years. Then the number of atoms decay in one second in $1 \mathrm{~g}$ of radium (Avogadro number $=\mathbf{6 . 0 2 3} \times \mathbf{1 0}^{\mathbf{2 3}}$ )
1 $4.23 \times 10^{9}$
2 $3.16 \times 10^{10}$
3 $3.61 \times 10^{10}$
4 $2.16 \times 10^{10}$
Explanation:
C Given, half life $\left(\mathrm{t}_{1 / 2}\right)=1620$ years $\therefore \quad \frac{\mathrm{dN}}{\mathrm{dt}}=\lambda \mathrm{N}$ $=\frac{\ln 2}{\mathrm{t}_{1 / 2}} \times \mathrm{N}$ $=\frac{0.6932}{1620 \times 365 \times 86400} \times \frac{6.023 \times 10^{23}}{226}$ $=3.61 \times 10^{10}$
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
NUCLEAR PHYSICS
147751
The operation of a nuclear reactor is said to be critical, if the multiplication factor $(k)$ has a value
1 1
2 1.5
3 2.1
4 2.5
Explanation:
A The operation of a nuclear reactor is said to be critical if the multiplication factor $(\mathrm{k})$ has a value 1 . The multiplication factor is $\mathrm{k}=\frac{\text { rate or production of neutrons }}{\text { rate of loss of neutrons }}$ If, $\quad \mathrm{k}>1$ explosions occurs If, $\quad \mathrm{k} \lt 1$ the chain reaction comes to half.
UP CPMT-2006
NUCLEAR PHYSICS
147742
The SI unit of radioactivity is :
1 Rutherford
2 Roentgen
3 Becquerel
4 Curie
Explanation:
C The SI unit of radioactivity is Becquerel (Bq).
Karnataka CET-2002
NUCLEAR PHYSICS
147763
If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?
1 Alpha rays
2 Beta rays
3 Gamma rays
4 All have same wavelength
Explanation:
D de-Broglie wavelength associated with matter is given by, $\lambda=\frac{h}{p}$ Where, $\mathrm{p}=$ momentum Since, alpha, beta and gamma rays carry same momentum. So all these have same wavelength.
JIPMER-2008
NUCLEAR PHYSICS
147767
The half-life of $\mathrm{Ra}^{226}$ is 1620 years. Then the number of atoms decay in one second in $1 \mathrm{~g}$ of radium (Avogadro number $=\mathbf{6 . 0 2 3} \times \mathbf{1 0}^{\mathbf{2 3}}$ )
1 $4.23 \times 10^{9}$
2 $3.16 \times 10^{10}$
3 $3.61 \times 10^{10}$
4 $2.16 \times 10^{10}$
Explanation:
C Given, half life $\left(\mathrm{t}_{1 / 2}\right)=1620$ years $\therefore \quad \frac{\mathrm{dN}}{\mathrm{dt}}=\lambda \mathrm{N}$ $=\frac{\ln 2}{\mathrm{t}_{1 / 2}} \times \mathrm{N}$ $=\frac{0.6932}{1620 \times 365 \times 86400} \times \frac{6.023 \times 10^{23}}{226}$ $=3.61 \times 10^{10}$