Plus Two Physics Chapter Wise Questions and Answers Chapter 12 Atoms
Plus Two Physics Chapter Wise Questions and Answers Chapter 12 Atoms
Kerala Plus Two Physics Chapter Wise Questions and Answers Chapter 12 Atoms
Plus Two Physics Atoms NCERT Text Book Questions and Answers
Question 1.
What is the shortest wavelength present in the Paschen series of spectral lines?
Answer:
Since
Plus Two Physics Atoms One Mark Questions and Answers
Question 1.
A radioactive nucleus emits beta particle. The parent and daughter nuclei are
(a) isotopes
(b) isotones
(c) isomers
(d) isobars
Answer:
(d) isobars
Question 2.
Consider an electron in the nth orbit of a hydrogen atom in the Bohr model. The circumference of the orbit can be expressed in terms of de Broglie wavelength λ of that electron as
(a) (0.529) nλ
Question 5.
In the Bohr model of the hydrogen atom, the lowest orbit corresponds to
(a) infinite energy
(b) maximum energy
(c) minimum energy
(d) zero energy
Answer:
(c) minimum energy.
Question 6.
Write down the Balmerformula for wavelength of Ha line.
Answer:
Plus Two Physics Atoms Two Mark Questions and Answers
Question 1.
Given Rydberg constant as 1.097 × 10-7m-1. Find the longest and shortest wavelength limit of Baler Series.
Answer:
Plus Two Physics Atoms Three Mark Questions and Answers
Question 1.
Bohr combined classical and early quantum concept and gave his theory in the form of three postulates.
- The total energy of an electron in ground state of hydrogen atom is -13.6eV. What is the significance of negative sign?
- The radius of innermost electron orbit of hydrogen atom is 5.3 × 1011m. What are the radii of n = 2 and n = 3 orbits?
Answer:
1. Negative sign implies that the electrons are strongly bounded to the nucleus.
2. rn = n2a0 = 5.3 × 10-11m
r1 = a0 = 5.3 × 10-11m
r2 = 4a0 = 21.2 × 10-11m
r3 = 9a0 = 47.7 × 10-11m.
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