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Choose the correct option :

(a) Antineutrino can be detected during the emission of :

(i) $\alpha$ -rays     (ii) $\beta$ -particles     (iii) Protons     (iv) X-rays

(b) Which has magic number of neutrons :

(i) $_{13}^{27}\textrm{Al}$        (ii) $_{83}^{209}\textrm{Bi}$     (iii) $_{92}^{238}\textrm{U}$       (iv) $_{26}^{56}\textrm{Fe}$

(c) $_{84}^{210}\textrm{Po}\rightarrow _{82}^{206}\textrm{Po}+_{2}^{4}\textrm{He}.$ In this reaction predict the position of group of Po when lead is in the IVB group :

(i) $I\! I A$         (ii) $I\! V B$         (iii) $V\! I\! B$         (iv) $V\! I\! A$

(d) Which of the following can show $\gamma$ -radiations :

(i) $_{37}^{81}\textrm{Rb}+_{-1}^{0}\textrm{e}\rightarrow _{36}^{81}\textrm{Kr}+...$                     (ii) $_{6}^{11}\textrm{C}\rightarrow _{5}^{11}\textrm{B}+...$

(iii) $_{7}^{11}\textrm{N}+_{2}^{4}\textrm{He}\rightarrow _{8}^{17}\textrm{O}+...$                       (iv) $_{27}^{60 m}\textrm{Co}\rightarrow _{27}^{60}\textrm{Co}+...$

Option: 1
a-i, b-ii, c-iii, d-iv

Option: 2
a-ii, b-i, c-iii, d-iii

Option: 3
a-ii, b-ii, c-iii, d-iv

Option: 4
a-ii, b-ii, c-iv, d-iv

Answers (1)

best_answer

Magic Numbers -

The repetition of the elements with similar properties in the order of increasing atomic number as in the periodic table is called periodicity of properties and the number 2, 8, 18 and 32 are called magic numbers.

-

EM radiation -

According to electromagnetic wave theory, energy is emitted continuously from a source in the form of radiations(or waves), known as electromagnetic radiations.

Relation between frequency, wavelength and wavenumber:

Frequency ∝1/wavelength wavenumber∝ 1/wavelength

Radio wave - $3\times 10^{14}\ to\ 3 \times 10^{7}\AA$

Micro wave - $3\times 10^{9}\ to\ 3 \times 10^{6}\AA$

Infrared - $6\times 6^{6}\ to\ 7600\AA$

Ultraviolet - $3800\ to\ 150\AA$

X-rays - $150\ to\ 0.1\AA$

Gamma rays - $0.1\ to\ 0.01\AA$

-

Neutron emission -

It is mode of radio active decay in which one or more neutron are ejected from a nucleus

- wherein

$_{4}^{13}Be\rightarrow _{4}^{12}Be+Neutron$

Theory Based

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