JEE Main 2020 (Online) 3rd September Evening Slot | Atoms and Nuclei Question 162 | Physics

The radius R of a nucleus of mass number A can be estimated by the formula
R = (1.3 $$ \times $$ 10^–15)A^1/3 m.
It follows that the mass density of a nucleus is of the order of :

(M_prot. $$ \cong $$ M_neut $$ \simeq $$ 1.67 $$ \times $$ 10^–27 kg)

10²⁴ kg m^–3

10¹⁰ kg m^–3

10¹⁷ kg m^–3

10³ kg m^–3

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

-1

Hydrogen ion and singly ionized helium atom are accelerated, from rest, through the same potential difference. The ratio of final speeds of hydrogen and helium ions is close to :

2 : 1

1 : 2

5 : 7

10 : 7

JEE Main 2020 (Online) 3rd September Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

In a radioactive material, fraction of active material remaining after time t is 9/16. The fraction that was remaining after t/2 is

$${3 \over 4}$$

$${4 \over 5}$$

$${3 \over 5}$$

$${7 \over 8}$$

JEE Main 2020 (Online) 2nd September Evening Slot

MCQ (Single Correct Answer)

-1

In a hydrogen atom the electron makes a transition from (n + 1)^th level to the n^th level. If n >> 1, the frequency of radiation emitted is proportional to :

$${1 \over n}$$

$${1 \over {{n^2}}}$$

$${1 \over {{n^3}}}$$

$${1 \over {{n^4}}}$$

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