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Both A and R are true and R is correct explanation of A

Both A and R are true and R is not correct explanation of A

A is true, R is false

A is false, R is true

Comprehension An electron orbits a stationary nucleus of charge + ze where z is a constant and e is the magnitude of electronic charge. It requires 47.2 eV to excite the electron form the second bohr orbit to third bohr orbit. The value of z is

5

4

3

2

A,B

B

C,D

A,B,C & D

Normal type of MCQ with one correct option How does the energy difference between the consecutive energy level vary as the quantum number ‘n’ increase?

Increases

Decreases

Remains unchanged

First increases and then decreases

Normal type of MCQ with one correct option The difference in angular momentum associated with the electron in the two successive orbits of hydrogen atom is

Normal type of MCQ with one correct option Band spectrum is produced by

H

He

H2

Na

Comprehension An electron orbits a stationary nucleus of charge + ze where z is a constant and e is the magnitude of electronic charge. It requires 47.2 eV to excite the electron form the second bohr orbit to third bohr orbit. Angular momentum of electron in first Bohr orbit:

1.05 × 10(13 J(s

2.10 × 10(13 J-s

3.15 × 10(13 J-s

Can be (a) or (b)

Normal type of MCQ with one correct option Given that R is Rydberg’s constant. When an electron in an atom of hydrogen jumps from an outer orbit n = 3 to an inner orbit n = 2 , the wavelength emitted radiations will be equal to:

Comprehension An electron orbits a stationary nucleus of charge + ze where z is a constant and e is the magnitude of electronic charge. It requires 47.2 eV to excite the electron form the second bohr orbit to third bohr orbit. The radius of first bohr orbit is

0.529 × 10(10 m

0.106 × 10(10 m

3.15 × 10(13 J-s

None

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