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Thomson's Model of an Atom & Limitations

The alpha par...

Question

The alpha particles used by Rutherford for bombardind the gold foil:
(A) have a mass of 2 amu charge +4
(B) have a mass of 4 amu and charge +2
(C) have a mass of 4 amu and charge +4
(D) have a mass of 1 amu and charge +1
Among these question which one is correct.

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Solution

The alpha particles have mass of 4 amu and charge +2.

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Neutrons are the particles with ___ electrical charge but have a mass of about 1 amu.

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Q. An alpha particle

(^{4} H e)

4.00300 a m u

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1.00867 a m u

respectively. The binding energy of alpha estimated from these data is closest to:

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(i) mass number
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(iii) the charge of nucleus in amu and
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Q. The energy released in the reaction

_{1} H^{2} +_{1} H^{3}

\to_{2} H e^{4} +_{0} n^{1}

- ------- -

_{0} n^{1} = 1.00867 a m u

_{1} H^{2} = 2.01410 a m u

_{1} H^{3} = 3.0160 a m u

_{2} H e^{4} = 4.0026 a m u

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Thomson's Model of an Atom & Limitations

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