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Class XI Chemistry Atomic Structure 7

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Question 1

Ionization energy of gaseous Na atom is

. The lowest possible frequency of light that ionized a sodium atom is

Question 2

Based on the equation :

the wavelength of the light that must be absorbed to excite hydrogen electron from level

to level

will be :

Question 3

If the shortest wavelength in Lyman series of hydrogen atom is A, then the longest wavelength in Paschen series of He⁺ is:

Question 4

The shortest wavelength of hydrogen atom in Lyman series is X. The longest wavelength in Balmer series of He⁺ is?

Question 5

Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is:

Question 6

The energy of an electron in first Bohr orbit of H-atom is -13.6eV. The energy value of electron in the excited state of Li²⁺ is :

Question 7

Uncertainty in position of a particle of 25 g in space is 10^-5m. Hence, uncertainty in velocity (ms^-1) is (Planck's constant h =6.6 x 10^-34 Js):

Question 8

and

be the threshold wavelength and wavelength of incident light, the velocity of photoelectron ejected from the metal surface is :

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