ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>QUESTIONS>Q 15

HARD

12th ICSE

IMPORTANT

Earn 100

The distance of closest approach $r_{0}$ depends upon the charge of the nucleus but not upon its mass, why?

Important Questions on Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>QUESTIONS>Q 16

An

α

-particle passing through a potential difference of

V

volt strikes a nucleus. Prove that if the atomic number be

Z

, then the distance of the closest approach of the particle to the nucleus will be

14.4 (\frac{Z}{V}) \overset{o}{A}

.

EASY

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>QUESTIONS>Q 17

Why is motion of planets around the sun not governed by Bohr's postulate of quantisation of angular momentum

(m v r = \frac{n h}{2 π})

?

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>QUESTIONS>Q 18

Using Bohr's formula for energy quantisation, find the excitation energy of

n = 3

level of

H e^{+}

ion.

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>QUESTIONS>Q 18

Using Bohr's formula for energy quantisation, find the ionisation potential of the ground state of

L i^{+ +}

ion.

MEDIUM

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>QUESTIONS>Q 19

Hydrogen atom has only one electron but its emission spectrum has many lines. Explain with reason.

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>QUESTIONS>Q 20

How are various lines of Lyman series formed? Explain on the basis of Bohr's theory.

MEDIUM

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>QUESTIONS>Q 21

The electron in an hydrogen atom is in the third excited state (

n = 4

level). What is the maximum number of photons that may be emitted in passing of the electron to the ground state? What is minimum number?

MEDIUM

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>QUESTIONS>Q 22

If hydrogen atoms are excited to the

4

th energy-level, how many different wavelengths are possible for the emitted radiation?