A sample of radioactive element has a mass of 10 gm at an instant t = 0. The approximate mass of this element in the sample after two means lives in [CBSE PMT/PDT 2003]

(1) 3.70 gm             (2) 6.30 gm             (3) 1.35 gm           (4) 2.50 gm

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Given a sample of Radium-226 having half-life of 4 days. Find the probability, a nucleus disintegrates after 2 half lives [IIT-JEE 2006]

(1) 1              (2) 1/2            (3) 1.5             (4) 3/4

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Complete the quation for the following fission process

${}_{92}U_{235}+{}_{0}n_{1}\to {}_{38}S{r}^{90}+........$  [1998]

(1)                       (2) ${}_{54}X{e}^{145}$

(3) ${}_{57}X{e}^{142}$                                   (4) ${}_{54}X{e}^{142}+{}_{0}n_{1}$

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Nuclear binding energy
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A nucleus ruptures into two nuclear parts, which have their velocity ratio equal to 2:1. what will be the ratio of their nuclear size (nuclear radius) ? [1996]

(1)               (2)              (3)                 (4)

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Nuclear binding energy
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The half-life of a radioactive material is 3h. If the initial amount is 300g, then after 18h, it will remain

(a) 4.68 g                                     (b) 46.8 g

(c) 9.375 g                                   (d) 93.75 g

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Half-life of a radioactive substance is 20 min. Difference between points of time when it is 33% disintegrated an 67% disintegrated is approximately

(1) 10 min            (2) 20 min            (3) 30 min            (4) 40  min

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When two deuterium nuclei fuse together to form a tritium nuclei, we get a [CPMT 2000]

(1) Neutron          (2) Deutron               (3) $\alpha$-particle               (4) Proton

Concept Questions :-

Nuclear binding energy
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The most penetrating radiation out of the following is [1997]

(1) $\gamma$-rays           (2) $\alpha$-particles             (3) $\beta$-rays               (4) X-rays

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Types of decay
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In any fission process the ratio  is         [2005]

(1) less than 1

(2) greater  than 1

(3) equal to 1

(4) depends on the mass of parent nucleus

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Nuclear binding energy
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The nucleus ${}_{48}C{d}^{115}$, after two successive $\beta$-decay will give [1988]

(1) ${}_{46}P{a}^{115}$                          (2) ${}_{49}I{n}^{114}$

(3) ${}_{50}S{n}^{113}$                          (4) ${}_{50}S{n}^{115}$

Concept Questions :-

Types of decay