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CBSE - Class 12 Physics Atoms Worksheet

Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?

Identify which of the following properties is extensive .

(a) volume

(b) temperature

volume

temperature

volume and temperature

boiling point

Choose the correct alternative from the clues given at the end of the each statement:
(b) In the ground state of .......... electrons are in stable equilibrium, while in .......... electrons always experience a net force.

a. Thomson’s model b. Rutherford’s model

Choose the correct alternative from the clues given at the end of the each statement:
(c) A classical atom based on .......... is doomed to collapse.

a. Thomson’s model b. Rutherford’s model

A hydrogen atom initially in the ground level absorbs a photon, which excites it to the $n = 4$ level. Determine the wavelength and frequency of photon.

Convert the temperature of the coldest area in a freezer, −10 °F, to degrees Celsius and kelvin.

23.33 C , 249.82K

-23.33C , - 249.82 K

-23.33 C, 249.82K

23.33 C , -249.82K

A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?

The radius of the innermost electron orbit of a hydrogen atom is $5.3 \times 10^{-11}$ m. What are the radii of the $n = 2$ and $n = 3$ orbits?

Calculate these masses.

(a) What is the mass of 6.00 cm3of mercury, density = 13.5939 g/cm3?

(b) What is the mass of 25.0 mL octane, density = 0.702 g/cm3?

81.56kg ,17.55 kg

81.56 g , 17.55g

81.56 mg, 17.55 mg

-81.56g, 17.55g

10.

(b) Calculate the orbital period in each of these levels.

11.

explain dalton atomic theory?

12.

Choose the correct alternative from the clues given at the end of the each statement:
(e) The positively charged part of the atom possesses most of the mass in ..........

a. Rutherford’s model b. both the models

13.

Choose the correct alternative from the clues given at the end of the each statement:
(d) An atom has a nearly continuous mass distribution in a .......... but has a highly non-uniform mass distribution in ..........

a. Thomson’s model b. Rutherford’s model

14.

(a) Using the Bohr’s model calculate the speed of the electron in a hydrogen atom in the $n = 1, 2$, and $3$ levels.

15.

Choose the correct alternative from the clues given at the end of the each statement:
(a) The size of the atom in Thomson’s model is .......... the atomic size in Rutherford’s model.

a. much greater than b. no different from c. much less than

16.

Classify each of the following as a compound:

(a) copper

(b) water

(d) sulfur

(e) air

(f) sucrose

(g) a substance composed of molecules each of which contains two iodine atoms

a , b , f , g

b , f

a,c , d

e, f

17.

In accordance with the Bohr’s model, find the quantum number that characterises the earth’s revolution around the sun in an orbit of radius $1.5 \times 10^{11}$ m with orbital speed $3 \times 10^{4}$ m/s. (Mass of earth = $6.0 \times 10^{24}$ kg.)

18.

The smallest particle of an element that can enter into a chemical combination is

element

compound

H2O

atom

19.

A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom make a transition from the upper level to the lower level?

20.

The ground state energy of hydrogen atom is –13.6 eV. What are the kinetic and potential energies of the electron in this state?

Worksheet Answers

Option A

Option C

Option B

12.

13.

15.

16.

Option B

18.

Option D

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