AIPMT 2011 Prelims | Atoms and Nuclei Question 66 | Physics

The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is

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 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 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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