Physics Part-II
Class 12
NCERT
1
Chapter 1: Ray Optics and Optical Instruments
41 questions
2
Chapter 2: Wave Optics
30 questions
3
Chapter 3: Dual Nature of Radiation and Matter
44 questions
4
Chapter 4: Atoms
23 questions
Q1
Obtain an expression for the frequency of radiation emitted when a hydrogen atom de-excites from level n to level (n). For large n, show that this frequency equals the classical frequency of revolution of the electron in the orbit.
Q2
12.14.
Classically, an electron can be in any orbit around the nucleus of an atom. Then what deteres the typical atomic size? Why is an atom not, say, thousand times bigger than its typical size? The question had greatly puzzled Bohr before he arrived at his famous model of the atom that you have learnt in the text. To simulate what he might well have done before his discovery, let us play as follows with the basic constants of nature and see if we can get a quantity with the dimensions of length that is roughly equal to the known size of an atom .
(a) Construct a quantity with the dimensions of length from the fundamental constants . Detere its numerical value.Q3
The total energy of an electron in the first excited state of the hydrogen atom is about .
What is the kinetic energy of the electron in this state?
What is the potential energy of the electron in this state
Which of the answers above would change if the choice of the zero of potential energy is changed?
View all questionWhat is the kinetic energy of the electron in this state?
What is the potential energy of the electron in this state
Which of the answers above would change if the choice of the zero of potential energy is changed?
5
Chapter 5: Nuclei
38 questions
6
Chapter 6: Semiconductor Electronics: Materials, Devices and Simple Circuits
25 questions
Question
Hard
Solving time: 5 mins
12.14.Classically, an electron can be in any orbit around the nucleus of an atom. Then what deteres the typical atomic size? Why is an atom not, say, thousand times bigger than its typical size? The question had greatly puzzled Bohr before he arrived at his famous model of the atom that you have learnt in the text. To simulate what he might well have done before his discovery, let us play as follows with the basic constants of nature and see if we can get a quantity with the dimensions of length that is roughly equal to the known size of an atom .
(a) Construct a quantity with the dimensions of length from the fundamental constants . Detere its numerical value.
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Text solution
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According to Coulomb's law, the force between hydrogen nucleus and electron is giben as:
Now, using the fundamental constants and , we will obtain a quantity which has the dimensions of length.
We know that (force x distance) is the amount work or energy and it is also given as
.
It is comparatively smaller than the size of the atom.
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Practice more questions from Physics Part-II (NCERT)
Q1
Obtain an expression for the frequency of radiation emitted when a hydrogen atom de-excites from level n to level (n). For large n, show that this frequency equals the classical frequency of revolution of the electron in the orbit.
Q2
12.14.
Classically, an electron can be in any orbit around the nucleus of an atom. Then what deteres the typical atomic size? Why is an atom not, say, thousand times bigger than its typical size? The question had greatly puzzled Bohr before he arrived at his famous model of the atom that you have learnt in the text. To simulate what he might well have done before his discovery, let us play as follows with the basic constants of nature and see if we can get a quantity with the dimensions of length that is roughly equal to the known size of an atom .
(a) Construct a quantity with the dimensions of length from the fundamental constants . Detere its numerical value.Q3
The total energy of an electron in the first excited state of the hydrogen atom is about .
What is the kinetic energy of the electron in this state?
What is the potential energy of the electron in this state
Which of the answers above would change if the choice of the zero of potential energy is changed?
View allWhat is the kinetic energy of the electron in this state?
What is the potential energy of the electron in this state
Which of the answers above would change if the choice of the zero of potential energy is changed?
Practice questions from Physics Part-II (NCERT)
Question 1
Hard
Views: 5,651
Question 2
Hard
Views: 6,228
Answer the following questions, which help you understand the difference between Thomson's model and Rutherford's model better.
(a) Is the average angle of deflection of -particles by a thin gold foil predicted by Thomson's model much less, about the same, or much greater than that predicted by Rutherford's model?(b) Is the probability of backward scattering (i.e., scattering of α-particles at angles greater than 90°) predicted by Thomson’s model much less, about the same, or much greater than that predicted by Rutherford’s model?
(c) Keeping other factors fixed, it is found experimentally that for small thickness t, the number of α-particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide?
(d) In which model is it completely wrong to ignore multiple scattering for the calculation of average angle of scattering of α-particles by a thin foil?
Question 3
Easy
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Question 4
Easy
Views: 6,210
Practice more questions from Atoms
Question 1
Hard
Views: 5,811
where q and p are generalized coordinate and momentum of the particle, n are integers. Making use of this rule, find the permitted values of energy for a particle of mass m moving
(a) in a unidimensional rectangular potential well of width l with infinitely high walls;
(b) along a circle of radius r;
(c) in a unidimensional potential field , where a is a positive constant;
(d) along a round orbit in a central field, where the potential energy of the particle is equal to U = —α/r (α is a positive constant).
Question 2
Medium
Views: 6,175
Question 3
Medium
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Question 4
Medium
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| Question Text | 12.14. Classically, an electron can be in any orbit around the nucleus of an atom. Then what deteres the typical atomic size? Why is an atom not, say, thousand times bigger than its typical size? The question had greatly puzzled Bohr before he arrived at his famous model of the atom that you have learnt in the text. To simulate what he might well have done before his discovery, let us play as follows with the basic constants of nature and see if we can get a quantity with the dimensions of length that is roughly equal to the known size of an atom . (a) Construct a quantity with the dimensions of length from the fundamental constants . Detere its numerical value. |
| Updated On | Apr 12, 2022 |
| Topic | Atoms |
| Subject | Physics |
| Class | Class 12 |
| Answer Type | Text solution:1 Video solution: 2 |
| Upvotes | 294 |
| Avg. Video Duration | 13 min |
