Beta Decay

Q.

How many protons, neutrons, and electrons are in Calcium?

Q. Tritium, a radioactive isotope of hydrogen, emits which of the following particles?

1. Neutron (n)
2. Beta $\left({\beta }^{–}\right)$
3. Alpha $\left(\alpha \right)$
4. Gamma $\left(\gamma \right)$

Q. Why nuclear reactions obey law of conservation of energy and matter when they do not obey law of conservation of energy?

Q. An alpha particle, a proton, a deutron and a neutron are projected towards the same nucleus with the same kinetic energy in different experiments. The distance of closet approach is minimum for

Q. ${}^{23}Na$ is the more stable isotope of Na. Find out the process by which ${}_{11}^{24}Na$ can undergo radioactive decay.

1. $K-$ electron capture
2. ${\beta }^{-}-$ emission
3. ${\beta }^{+}-$ emission
4. $\alpha -$ emission

Q. Bombardment of aluminium by $\alpha -$ particle leads to its artificial disintegration in two ways. (i) and (ii) as shown. Products X, Y and Z respectively are :

1. Neutron, positron, proton
2. Proton, positron, neutron
3. Positron, proton, neutron
4. Proton, neutron, positron

Q.

In which of the following, the reaction proceeds towards completion

1. K = 10

2. K = 10³

3. K=10^-2

4. K = 1

Q. Decrease in atomic number is observed during:

1. Alpha emission
2. Beta emission
3. Positron emission
4. Electron capture

Q.

Which isotope of hydrogen : Protium, deuterium or tritium has maximum ionisation energy and why?

Q. During a negative beta decay:

1. An atomic electron is ejected
2. An electron which is already present within the nucleus is ejected
3. A neutron in the nucleus decays emitting an electron
4. A proton in the nucleus decays emitting an electron

Q. A radioactive element decays as:

Which of the following statements about this decay process is/are incorrect?

1. After two hours, less than 10% of the initial X is left
2. Maximum amount of Y present at any time before 30 min is less than 50% of the initial amount of X
3. Atomic number of X and Y is the same
4. Mass number of X and Y is the same

Q. A plot of the number of neutrons (n) against the number of protons (p) of stable nuclei exhibits upward deviation from linearity for atomic number, Z> 20. For an unstable nucleus having n/p ratio less than 1, the possible mode(s) of decay is (are)

1. ${\beta }^{-}$ - decay ($\beta$ - emmision)
2. orbital of K - electron capture
3. neutron emission
4. ${\beta }^{+}$ - decay (positron emission)
   

Q.

What is the sum of protons, electrons and neutrons in a stable isotope of cobalt?

1. 86

2. 87

3. 88

4. 89

Q.

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For an element decaying through simultaneous reaction, the half-life for the respective decaying path is $1400s$ and $700s$. Find the time taken when the number of atoms becomes$N_{\circ }/3N$ in the element sample $(N_{\circ }istheinitialnumberofatomsinsample)$.

1. $(1400/5)\ln 3$

2. $(1400/3)\ln 3$

3. $(1400/3)\ln 2$

4. $(700/3)\ln 2$

Q. ${}_{13}^{27}Al$ is a stable isotope. ${}_{13}^{29}Al$ is expected to decay by :

1. $\beta -$ emission
2. Positron emission
3. $\alpha -$ emission
4. Proton emission

Q.

Bombardment of aluminium of α-particle leads to its artificial disintegration in two ways (i) and (ii) as shown below. Product X, Y, and Z, respectively, are

${}_{14}S{i}^{30}+X\stackrel{\left(i\right)}{\leftarrow }{}_{13}A{l}^{27}\stackrel{\left(ii\right)}{\to }{}_{15}{P}^{30}+Y\to {}_{14}S{i}^{30}+Z$

(IIT-JEE, 2011)

1. Proton, neutron, positron

2. Neutron, positron, proton

3. Positron, proton, neutron
4. Proton, positron, neutron

Q. The nuclear reactions accompanied with emission of neutron(s) are:

1. ${}_{13}^{27}Al{+}_2^{4}He{\to }_{15}^{30}P$
2. ${}_6^{12}C{+}_1^{1}H{\to }_7^{13}N$
3. ${}_{15}^{30}P{\to }_{14}^{30}Si{+}_1^{0}e$
4. ${}_{96}^{241}Cm{+}_2^{4}He{\to }_{97}^{244}Bk{+}_1^{0}e$

Q. During a negative beta decay:

1. An atomic electron is ejected
2. An electron which is already present within the nucleus is ejected
3. A neutron in the nucleus decays emitting an electron
4. A proton in the nucleus decays emitting an electron

Q. At a given instant these are $25\%$ undecayed radioactive nuclei in a sample. After $10$ second, the number of undecayed nuclei reduces to $12.5\%$ calculate:
(a) Mean life of nuclei.
(b) The time in which the number of undecayed nuclei will further reduce to $6.25\%$ of the reduced number.

Q. A radioactive substance has a half life of four months. Three fourth of the substance will decay in

1. Three months
2. Four months
3. Eight months
4. Twelve months

Q. Although a neutron within a nucleus is stable, a neutron in free space decays into a proton and an electron ($\beta$ - particle). The correct equation is:

1. ${}_0^{1}n{⟶}_1^{1}p{+}_{-1}^0\beta$
2. ${}_0^{1}n{⟶}_1^{1}p{+}_{-1}^1\beta$
3. ${}_0^{1}n{⟶}_1^{1}p{+}_1^0\beta$
4. None of these

Q.

The binding energy per nucleon of $${}_3^{7}Li$$and $${}_2^{4}He$$nuclei are $5.06\mathrm{MeV}$and $7.06\mathrm{MeV}$, respectively. In the nuclear reaction$${}_3^{7}Li{+}_1^{1}H{\to }_2^{4}He{+}_2^{4}He+Q$$ What Will Be The Value Of Energy $$Q$$ released ?

Q. The nuclear reactions accompanied with emission of neutron(s) are:

1. ${}_{13}^{27}Al{+}_2^{4}He{\to }_{15}^{30}P$
2. ${}_6^{12}C{+}_1^{1}H{\to }_7^{13}N$
3. ${}_{15}^{30}P{\to }_{14}^{30}Si{+}_1^{0}e$
4. ${}_{96}^{241}Cm{+}_2^{4}He{\to }_{97}^{244}Bk{+}_1^{0}e$

Q. Half life of a radioactive element is $10$ years. What percentage of it will decay in $100$ years?

1. $0.1$%
2. $100$%
3. $99.9$%
4. $10$%

Q. In radioactive decay process, the negatively charged emitted $\beta$-particles are:

1. the electrons orbiting around the nucleus
2. the electrons present inside the nucleus
3. the electrons produced as a result of the decay of neutrons inside the nucleus
4. the electrons produced as a result of collisions between atoms

Q. Radioactive disintegration is a reaction of:

1. second order
2. third order
3. first order
4. zero order

Q. Both $\alpha$ and $\beta$-particles are emitted in a radioactive decay series.

If true enter 1, else enter 0.

Q. A positron is emitted from ${}_{11}^{23}Na$. The ratio of the atomic mass and atomic number of the resulting nuclide is:

1. $\frac{22}{10}$
2. $\frac{22}{11}$
3. $\frac{23}{10}$
4. $\frac{23}{12}$

Q.

What is the order of ip2 values of boron and beryllium? Can we check it by using effective nuclear charge concept or is there any other procedure?

Q.

1. True
2. False