Nuclei Test

Result

Nuclei Test - 69

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Weekly Quiz Competition

Question 1
1 / -0

A proton, a deutron and an $$\alpha $$- particle accelerated through the same potential difference enter a region of uniform magnetic field moving at right angles to it. What is the ratio of their kinetic energy?

A
1 : 1 : 2

B
2 : 2 : 1

C
1 : 2 : 1

D
2: 1 : 1

Solution
Question 2
1 / -0

When a $$\beta^-$$ -particle is emitted from a nucleus, the neutron-proton ratio:

A
Is decreased

B
Is increased

C
Remains the same

D
First (1) and then (2)
Question 3
1 / -0

For two different radioactive sample activity verses time curve is

A
$$\lambda_1 > \lambda_2$$

B
$$\lambda_1 < \lambda_2$$

C
$$\lambda_1 = \lambda_2$$

D
data insufficiant

Solution
Question 4
1 / -0

The relation between $$U(r)$$ and r for diatomic molecule is given as $$U(r)=\dfrac{a}{r^{12}} - \dfrac{b}{r^5}$$
The energy of dissociation of the molecule if given as

A
$$\dfrac{b^2}{4a^2}$$

B
$$\dfrac{b^2}{4a}$$

C
$$\dfrac{4a^2}{b^2}$$

D
$$\dfrac{4a}{b^2}$$

Solution
Question 5
1 / -0

Let $${ m }_{ p }$$ be the mass of a proton, $${ m }_{ n }$$ the mas of a neutron, $${ M }_{ 1 }$$ the mass of a $$^{20}_{10}Ne$$ nucleus and $${ M }_{ 2 }$$ the mass of a $$^{ 40 }_{ 20 }Ca$$ nucleus. Then

A
$${ M }_{ 2 }=2{ M }_{ 1 }$$

B
$${ M }_{ 2 }>2{ M_1 }$$

C
$${ M }_{ 2 }<2{ M_{ 1 } }$$

D
$${ M }_{ 1 }>10\left( { m }_{ n }+{ m }_{ p } \right) $$

Solution
Question 6
1 / -0

An X-ray pulse of wavelength $$4.9 A^{o}$$ is sent through a section of Wilson cloud chamber containing a supersaturated gas, and tracks of photoelectron ejected from the gaseous atoms are observed. Two groups of tracks of lengths $$1.40 cm$$ and $$2.02 cm$$ are noted. If the range energy relation for cloud chamber is given by $$R = aE$$ with $$ \alpha = \frac { 1 \mathrm { cm } } { k e V }$$. Obtain the binding energies of the two levels from which electrons are emitted. Given $$ h = 6.63 \times 10 ^ { - 34 } \mathrm { J } - \mathrm { s } , \mathrm { e } = 1.6 \times 10 ^ { - 19 } \mathrm { J } $$

A
$$\phi_{1} = 1.14 KeV$$ $$\phi_{2}=0.52 KeV$$

B
$$\phi_{1} = 1.14 KeV$$ $$\phi_{2}=0.75 KeV$$

C
$$\phi_{1} = 0.52 KeV$$ $$\phi_{2}=0.75 KeV$$

D
$$\phi_{1} = 1.14 KeV$$ $$\phi_{2}=0.52 KeV$$

Solution
Question 7
1 / -0

The count rate of a radioactive source at $$t = 0$$ was $$1600$$ count/s and at $$t = 8 { s },$$ it was $$100$$ count/s. The count rate (in counts) at $$t = 6 s$$ was

A
$$150$$

B
$$200$$

C
$$300$$

D
$$400$$

Solution
Question 8
1 / -0

The binding energy of deutron is $$2.23MeV$$. What should be its mass defect in the units of $$amu$$ or $$u$$ ?

A
$$0.0012$$

B
$$0.0024$$

C
$$0.0242$$

D
$$0.2422$$

Solution
Question 9
1 / -0

In an $$\alpha$$-decay the Kinetic energy of $$\alpha$$ particle is 48 MeV and Q-value of the reaction is 50 MeV. The mass number of the mother nucleus is : (Assume that daughter nucleus is in ground state)

A
96

B
100

C
104

D
none of these

Solution
Question 10
1 / -0

The kinetic energy of $$\alpha$$ -particle emitted in the $$\alpha$$ -decay of $$88 \mathrm { Ra } ^ { 226 }$$ is [given, mass number of $$\mathrm { Ra } = 222 \mathrm { u } ]$$

A
$$5.201 \mathrm { MeV }$$

B
$$3.301 \mathrm { MeV }$$

C
$$6.023 \mathrm { MeV }$$

D
$$4.871 \mathrm { MeV }$$

Solution