The nuclear radius of Al 13 27 is 3 . 6 fermi. Find the nuclear radius of Cu 29 64 .

Radius of Al is r Al = r ∘ A 1 3 = r ∘ 27 1 3 = 3 . 6 fermi, here A is atomic mass number corresponding to Al . For the radius of Cu is r Cu = r ∘ A 1 3 = r ∘ 64 1 3 . Now, r Cu r Al = 64 1 3 27 1 3 = 4 3 ⇒ r Cu = r Al × 4 3 = 4 . 8 fermi. Hence, the nuclear radius of Cu 29 64 is 4 . 8 fermi.

Calculate the nuclear radii of Ba 8 140 and O 8 17 . Given R 0 = 1 . 5 fm .

Given, R 0 = 1 . 5 fm The mass number of B 8 140 a is A 1 = 140 The mass number of O 8 17 is A 2 = 17 We know that the radius is given as, R = R 0 A 1 3 , where A is the mass number. Therefore, the radius of Barium becomes, R 1 = R 0 ( A 1 ) 1 / 3 = R 0 ( 140 ) 1 / 3 = 1 . 5 × 5 . 2 = 7 . 8 fm Similarly, the radius of Oxygen becomes, R 2 = R 0 ( A 2 ) 1 / 3 = R 0 ( 17 ) 1 / 3 = 1 . 5 × 2 . 57 = 3 . 85 fm

Find nuclear mass density of U 92 238 . Given R 0 = 1 . 5 fm and mass of each nucleon = 1 . 67 × 10 - 27 kg . .

Given, R 0 = 1 . 5 fm Mass per nucleon, M = 1 . 67 × 10 - 27 kg The mass number, A = 238 Density = Mass Volume ⇒ d = A × M A × 4 3 π R 0 3 = 238 × 1.66 × 10 − 27 238 × 4 3 π × ( 1.5 × 10 − 15 ) 3 = 1 .18 × 10 17 kg / m 3

Radius of a nucleus of mass number 16 is 3 × 10 15 m . What is the radius of a nucleus of mass number 128 .

We know that R = R 0 A 1 3 Its given : A 1 = 16 R 1 = 3 × 10 15 m A 2 = 128 Using the above equation: R 2 R 1 = A 2 A 1 1 / 3 = 128 16 1 / 3 = ( 8 ) 1 / 3 = 2 ⇒ R 2 = 2 R 1 = 6 × 10 - 15 m . Here, the symbols have their usual meaning.

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Which of the following was a significant characteristic of Harappan urban planning?

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Important Questions on Atoms

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

Industrial melanism is an example of:

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

The ratio of mass densities of nuclei of

^{40} C a

and

^{16} O

is close to:

MEDIUM

Physics>Modern Physics>Atoms>Early Atomic Models

The brain capacities of which man were between 650-800 cc in course of human evolution?

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

Write the names of the following:

A 2 mya primate that lived in East African grasslands.

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

Genetic drift

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

Write the names of the following :

A 15 mya primate that was ape-like.

EASY

Physics>Modern Physics>Atoms>Early Atomic Models

A population will not exist in Hardy-Weinberg equilibrium if:

MEDIUM

Physics>Modern Physics>Atoms>Early Atomic Models

The nuclear radius of