GATE PH topic:atomic-molecular-physics PYQs & Answers — Page 2

Questions 11–20 of 44. Imported answers require independent review unless marked reviewed.

The curves P and Q schematically show the variation of X-ray intensity with wavelength at two different accelerating voltages for a given target material. In the figure

, and

. Take Planck’s constant as

Js, speed of light as

and elementary charge as

Which of the following statement is/are true?

Your answerSelect all correct options. You can choose more than one.

The accelerating potential corresponding to curve P is greater than that of curve Q

The accelerating potential applied to obtain curve Q is 24750 V

Peaks (II) and (IV) correspond to radiative transitions from L to K shells

Peaks (I) and (II) correspond to radiative transitions from N to K shells

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The atomic number of an atom is 6. What is the spectroscopic notation of its ground state, according to Hund’s rules?

Your answerChoose one option.

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An atom with non-zero magnetic moment has an angular momentum of magnitude

. When a beam of such atoms is passed through a Stern-Gerlach apparatus, how many beams does it split into?

Your answerChoose one option.

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In the vector model of angular momentum applied to atoms, what is the minimum angle in degrees (in integer) made by the orbital angular momentum vector and the positive

axis for a

electron?

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It is given that the electronic ground state of a diatomic molecule

has even parity and the nuclear spin of

is 0. Which one of the following is the CORRECT statement with regard to the rotational Raman spectrum (

is the rotational quantum number) of this molecule?

Your answerChoose one option.

Lines of all

values are present

Lines have alternating intensity in the ratio of 3:1

Lines of only even

values are present

Lines of only odd

values are present

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Different spectral lines of the Balmer series (transitions

, with

being the principal quantum number) fall one at a time on a Young’s double slit apparatus. The separation between the slits is

and the screen is placed at a constant distance from the slits. What factor should

be multiplied by to maintain a constant fringe width for various lines, as

takes different allowed values?

Your answerChoose one option.

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An excited state of Ca atom is [Mg]

. The spectroscopic terms corresponding to the total orbital angular momentum are

Your answerChoose one option.

S, P, and D

P, D, and F

P and D

S and P

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For normal Zeeman lines observed

and

to the magnetic field applied to an atom, which of the following statements are true?

Your answerSelect all correct options. You can choose more than one.

Only

-lines are observed

to the field

-lines

to the field are plane polarized

-lines

to the field are plane polarized

Only

-lines are observed

to the field

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In a solid, a Raman line observed at

has intensity of Stokes line four times that of the anti-Stokes line. The temperature of the sample is ______ K. (Round off to the nearest integer) (

)

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In a diatomic molecule of mass

, electronic, rotational and vibrational energy scales are of magnitude

and

, respectively. The spring constant for the vibrational energy is determined by

. If the electron mass is

then

Your answerSelect all correct options. You can choose more than one.

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GATE PH topic:atomic-molecular-physics PYQs

Question 53

Question 14

Question 25

Question 33

Question 36

Question 54

Question 14

Question 22

Question 32

Question 50