AIPMT 2011 Prelims | Atoms and Nuclei Question 58 | Physics

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AIPMT 2011 Prelims

MCQ (Single Correct Answer)

-1

Fusion reaction takes place at high temperature because

nuclei break up at high temperature

atoms get ionised at high temperature

kinetic energy is high enough to overcome the coulomb repulsion between nuclei

molecules break up at high temperature

AIPMT 2010 Mains

MCQ (Single Correct Answer)

-1

The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is

23.6 MeV

2.2 MeV

28.0 MeV

30.2 MeV

AIPMT 2010 Mains

MCQ (Single Correct Answer)

-1

Out of Syllabus

The decay constant of a radio isotope is $$\lambda $$. If A₁ and A₂ are its activities at times t₁ and t₂ respectively, the number of nuclei which have decayed during the time (t₁ $$-$$ t₂)

A₁t₁ $$-$$ A₂t₂

A₁ $$-$$ A₂

(A₁ $$-$$ A₂)/$$\lambda $$

$$\lambda ({A_1} - {A_2})$$

AIPMT 2010 Prelims

MCQ (Single Correct Answer)

-1

Out of Syllabus

The activity of a radioactive sample is measured as N₀ counts per minute at t = 0 and N₀/e counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is

$${\log _e}{2 \over 5}$$

$${5 \over {{{\log }_e}2}}$$

5log₁₀2

5log_e 2

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