AIPMT 2014 | Atoms and Nuclei Question 45 | Physics

A radioactive X with a half life 1.4 $$ \times $$ 10⁹ years decays to Y which is stable. A sample of the rock from a cave was found to contain X and Y in the ratio 1 : 7. The age of the rock is

1.96 $$ \times $$ 10⁹ years

3.92 $$ \times $$ 10⁹ years

4.20 $$ \times $$ 10⁹ years

8.40 $$ \times $$ 10⁹ years

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

Out of Syllabus

$$\alpha $$-particles, $$\beta $$-particles and $$\gamma $$-rays are all having same energy. Their penetrating power in a given medium in increasing order will be

$$\gamma $$, $$\alpha $$, $$\beta $$

$$\alpha $$, $$\beta $$, $$\gamma $$

$$\beta $$, $$\alpha $$, $$\gamma $$

$$\beta $$, $$\gamma $$, $$\alpha $$

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

An electron in hydrogen atom makes a transition n₁ $$ \to $$ n₂ where n₁ and n₂ are principal quantum numbers of the two states . Assuming Bohr's model to be valid, the time period of the electron in the initial state is eight times that in the final state. The possible values of n₁ and n₂ are

n₁ = 6 and n₂ = 2

n₁ = 8 and n₂ = 1

n₁ = 8 and n₂ = 2

n₁ = 4 and n₂ = 2

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

How does the Binding Energy per nucleon vary with the increase in the number of nucleons ?

Decrease continuously with mass number.

First decreases and then increases with increase in mass number.

First increases and then decreases with increase in mass number.

increases continuously with mass number.

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Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution