Daily Practice Problems undefined Atoms

Question 1:

All noble gas molecules are-

(a) monoatomic

(b) diatomic

(d) both (a) and (b)

Question 2:

Balmer series lies in which spectrum?

(a) visible

(b) UV

(d) partially visible, partially infrared

Question 3:

The angular momentum of electron in n^th orbit is given by:

(a) nh

(b) nh/2π

(d) None

Question 4:

If an electron jumps from 1^st orbit to 2^nd orbit, then it will

(a) absorb energy

(b) release energy

(d) None

Question 5:

Isotones have the same:

(a) A

(b) Z

(d) All the above

Question 6:

Define impact parameter.

Question 7:

What is the acronym of LASER?

(a) Light Amplification by Stimulated Emission of Radiation

(b) Light Amplify by stimulated emission of radiation

(d) None

Question 8:

According to the classical electromagnetic theory, calculate the initial frequency of the light emitted by the electron revolving around a proton in hydrogen atom.

Question 9:

The radius of innermost electron orbit of a hydrogen atom is 5.3 × 10^-11 m. What is the radius of orbit in the second excited state?

Question 10:

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

Question 11:

If the average life time of an excited state of hydrogen is of the order of 10^-8 s, estimate how many rotations an electron makes when it is in the state n= 2 and before it suffers a transition to state n = 1. Bohr radius = 5.3 × 10^-11 m

Question 12:

(i) In hydrogen atom, an electron undergoes transition from 3^rd excited state to the first excited state and then to the ground state. Identify the spectral series to which these transitions belong.

(ii) Find out the ratio of the wavelengths of the emitted radiations in the two cases.

Question 13:

Define ionization energy. How would the ionization energy change when electron in hydrogen atom is replaced by a particle of mass 200 times that of the electron but having the same charge?

Question 14:

Define Bohr radius. Also, state the limitations of Bohr model?

Question 15:

Calculate the radius of 1^st orbit of hydrogen atom. Show that the velocity of electrons in the 1^st orbit is 1/137 times the velocity of light.

Question 16:

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 1.5×10¹¹m with orbital speed 3×10⁴m/s (Mass of earth =6.0×10²⁴kg.)?

Question 17:

Prove that the speed of election in the ground state of hydrogen atom is equal to the speed of electron in the first excited state of hydrogen like Li⁺⁺?

Question 18:

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about 10⁻¹⁴. An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction.

Question 19:

(i) A hydrogen atom initially in the ground state absorbs a photon which excites it to the n- 4 level. Determine the wavelength of the photon.

(ii) The radius of innermost electron orbit of a hydrogen atom is 5.3 × 10^-11m. Determine its radius in n = 4 orbit.

Question 20:

A 10 kg satellite circles earth once every 2 h in an orbit having a radius of 8000 km. Assuming that Bohr’s angular momentum postulate applies to satellites just as it does to an electron in the hydrogen atom, find the quantum number of the orbit of the satellite.

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Application of Knowledge: Problem-solving allows you to apply the theoretical concepts of the topic Class 12 Physics Atoms you have learned to real-life situations. It helps you bridge the gap between abstract knowledge and practical scenarios, making the learning more relevant and meaningful.
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In summary, problem-solving after learning a theoretical concept on CBSE Atoms Class 12 Physics is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.

You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.

Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.

All About Daily Practice Problems on Class 12 Physics Atoms NCERT Chapter 12

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 12 Physics Atoms NCERT Chapter 12 useful.

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