NEET 2013 | Atoms and Nuclei Question 49 | Physics

NEET 2013

MCQ (Single Correct Answer)

-1

Out of Syllabus

The half life of a radioactive isotope 'X' is 20 years. It decays to another element 'Y' which is stable. The two elements 'X' and 'Y' were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be

80 years

100 years

40 years

60 years

NEET 2013

MCQ (Single Correct Answer)

-1

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (given 1 u = 931 MeV)

6.675 MeV

13.35 MeV

2.67 MeV

26.7 MeV

NEET 2013

MCQ (Single Correct Answer)

-1

Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is

$${7 \over {29}}$$

$${9 \over {31}}$$

$${5 \over {27}}$$

$${3 \over {23}}$$

AIPMT 2012 Mains

MCQ (Single Correct Answer)

-1

The transition from the state n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

2 $$ \to $$ 1

3 $$ \to $$ 2

4 $$ \to $$ 2

4 $$ \to $$ 3

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