AIPMT 2003 | Atoms and Nuclei Question 108 | Physics

AIPMT 2003

MCQ (Single Correct Answer)

-1

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force $$\overrightarrow F $$ between the two is

$$K{{{e^2}} \over {{r^2}}}\widehat r$$

$$ - K{{{e^2}} \over {{r^3}}}\widehat r$$

$$K{{{e^2}} \over {{r^3}}}\widehat r$$

$$ - K{{{e^2}} \over {{r^2}}}\widehat r$$

AIPMT 2003

MCQ (Single Correct Answer)

-1

Out of Syllabus

A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element in the sample after two mean lives is

1.35 g

2.50 g

3.70 g

6.30 g

AIPMT 2003

MCQ (Single Correct Answer)

-1

Out of Syllabus

The mass number of a nucleus is

always less than its atomic number

always more than its atomic number

sometimes equal to its atomic number

sometimes less than and sometimes more than its atomic number

AIPMT 2003

MCQ (Single Correct Answer)

-1

In which of the following systems will the radius of the first orbit (n = 1) be minimum ?

doubly ionized lithium

singly ionized helium

deuterium atom

hydrogen atom

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