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Questions and Answers
What occurs when atoms in a discharge tube jump to their ground state?
What occurs when atoms in a discharge tube jump to their ground state?
- They emit only visible light.
- They absorb radiation from the environment.
- They emit no radiation.
- They emit multiple forms of radiation. (correct)
How is the radiation spectrum obtained in the experiment described?
How is the radiation spectrum obtained in the experiment described?
- By blocking all other forms of radiation.
- By reflecting emitted light onto a fluorescing screen.
- By allowing emitted radiations to pass through a spectrometer. (correct)
- By using a light source to illuminate a filter.
What role do excited states play in the emission of radiation from atoms in the tube?
What role do excited states play in the emission of radiation from atoms in the tube?
- They lead to the emission of radiation during de-excitation. (correct)
- They decrease the intensity of emitted light.
- They are necessary for energy absorption.
- They cause the atom to disintegrate.
What is depicted on the fluorescent screen during the experiment?
What is depicted on the fluorescent screen during the experiment?
What is indicated by the infinite number of atoms in the discharge tube?
What is indicated by the infinite number of atoms in the discharge tube?
What measurement unit is suggested for certain wavelengths observed in the radiation spectrum?
What measurement unit is suggested for certain wavelengths observed in the radiation spectrum?
What year was the first edition of the book published?
What year was the first edition of the book published?
Which company is responsible for the typesetting of the book?
Which company is responsible for the typesetting of the book?
What is the ISBN of the book?
What is the ISBN of the book?
Which of the following is true regarding reproduction of the book?
Which of the following is true regarding reproduction of the book?
Where is CL Media (P) Ltd. located?
Where is CL Media (P) Ltd. located?
What is the email contact for product information?
What is the email contact for product information?
The book is dedicated to which individuals?
The book is dedicated to which individuals?
Which of the following statements is correct regarding the administrative offices?
Which of the following statements is correct regarding the administrative offices?
What is the energy of an electron in the ground state of a hydrogen-like atom?
What is the energy of an electron in the ground state of a hydrogen-like atom?
What series consists of wavelengths emitted when an electron jumps to the n=4 orbit?
What series consists of wavelengths emitted when an electron jumps to the n=4 orbit?
Which of the following series includes transitions to the n=5 orbit?
Which of the following series includes transitions to the n=5 orbit?
Which series emits wavelengths in the Deep Infra Red region?
Which series emits wavelengths in the Deep Infra Red region?
What is the first member wavelength of the Balmer series in the hydrogen spectrum?
What is the first member wavelength of the Balmer series in the hydrogen spectrum?
The ionization energy of a hydrogen-like atom is equal to what value?
The ionization energy of a hydrogen-like atom is equal to what value?
Electrons of which energy can cause emitted radiation from hydrogen atoms?
Electrons of which energy can cause emitted radiation from hydrogen atoms?
What orbital transition produces the first line of the Brackett series?
What orbital transition produces the first line of the Brackett series?
What does an electron emit when it transitions from a higher to a lower energy state in a hydrogenic atom?
What does an electron emit when it transitions from a higher to a lower energy state in a hydrogenic atom?
Which spectral series corresponds to the transitions of hydrogen electron emitting wavelengths in the ultraviolet region?
Which spectral series corresponds to the transitions of hydrogen electron emitting wavelengths in the ultraviolet region?
In a hydrogenic atom, how many different ways can an electron transition from the nth state to the ground state?
In a hydrogenic atom, how many different ways can an electron transition from the nth state to the ground state?
What is observed in the hydrogen spectrum that indicates the presence of different transitions?
What is observed in the hydrogen spectrum that indicates the presence of different transitions?
What occurs to an electron in a gas containing several hydrogen atoms/ions when they are excited to the nth state?
What occurs to an electron in a gas containing several hydrogen atoms/ions when they are excited to the nth state?
Which of the following series is NOT a spectral series of the hydrogen atom?
Which of the following series is NOT a spectral series of the hydrogen atom?
What is the primary focus of the chapter discussed?
What is the primary focus of the chapter discussed?
Why is experimental evidence crucial in understanding atomic structures?
Why is experimental evidence crucial in understanding atomic structures?
Which aspect of atomic physics is highlighted as lacking in student knowledge?
Which aspect of atomic physics is highlighted as lacking in student knowledge?
What is one fundamental fact likely explained in this chapter?
What is one fundamental fact likely explained in this chapter?
What element of atomic physics is addressed regarding student misconceptions?
What element of atomic physics is addressed regarding student misconceptions?
Which of the following would be a significant reason for studying atomic physics in detail?
Which of the following would be a significant reason for studying atomic physics in detail?
What could be considered a preceding topic before discussing atomic structures?
What could be considered a preceding topic before discussing atomic structures?
What type of knowledge is primarily associated with this chapter?
What type of knowledge is primarily associated with this chapter?
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Study Notes
Editions and Publication Information
- First Edition released in 2000, with revised editions in 2017 and 2019-20.
- Published by CL Media (P) Ltd., located in New Delhi, India.
- ISBN for the book: 978-93-87444-70-6.
- Product information available at www.gkpublications.com.
Atomic Physics Overview
- Focuses on experimental evidence supporting atomic theory.
- Discusses fundamental facts regarding atomic structures.
- Explores principles of atomic transitions and emissions.
Electron Transitions and Spectral Series
- Electrons transition from excited states to lower energy states, emitting radiation.
- The emitted spectral lines correspond to specific wavelengths, observable in discharge tubes.
- The hydrogen spectral lines are divided into several series:
- Lyman Series: Transitions to n=1.
- Balmer Series: Transitions to n=2.
- Paschen Series: Transitions to n=3.
- Brackett Series: Emission from n to n=4 orbits, lies in the Infrared region.
- Pfund Series: Emission from n to n=5 orbits, lies in the Deep Infrared region.
Energy and Ionization in Hydrogen-like Atoms
- Energy of electrons in the ground state of a hydrogen-like atom is given by:
- ( E = -13.6 \frac{Z^2}{n^2} ) eV, where Z is the atomic number.
- Ionization energy is equal in magnitude to the energy of the ground state.
Calculating Wavelengths of Emission
- Wavelengths can be determined for transitions between energy levels.
- Electrons with energies of 10.20 eV and 12.09 eV can cause radiation emissions in hydrogen.
- Example: The first line of the Balmer series corresponds to a wavelength of 6563 Å.
Experimental Evidence and Spectra
- Experiments demonstrate the existence and structure of atoms.
- Observations of spectral lines provide insights into atomic behavior and energy levels.
- The blank bands in the spectral lines indicate energy levels where no transitions occur, deepening understanding of atomic structure.
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