Slope of V0 vs v curve is (where V0=stopping potential, v=subjected frequency)

1.  e

2.  he

3.  ϕ

4.  h

Subtopic:  Photo Electric Effect |
 81%
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An excited state of H atom emits a photon of wavelength λ and returns in the ground state, the principal quantum number of excited state is given by:

1.  λRλR-1

2.  λRλR-1

3.  λRλR+1

4.  λR-1λR

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 71%
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Each questions contains STATEMENT-1 (Assertion) and STATEMENT2- (Reason).

Examine the statements carefully and mark the correct answer according to the instructions given below:

Statement-1: Emitted radiation will fall in visible range when an electron jump from n=4 to n=2 in H-atom

Statement-2: Balmer series radiations belong to visible range for hydrogen atom .

1.  If both the statement are true and statement -2 is the correct explanation of statement-1

2.  If both the statements are true but statement-2 is not the correct explanation of statement-1

3.  If statement-1 is true and statement-2 is false

4.  If statement-1 is false and statement-2 is true

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Hydrogen Spectra |
 64%
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Which of the following expressions represents the spectrum of Balmer series (If n is the principal quantum number of higher energy level) in Hydrogen atom?

1.  v¯=Rn-1 n+1n2 cm-1

2.  v¯=Rn-2 n+24n2 cm-1

3.  v¯=Rn-2 n+2n2 cm-1

4.  v¯=Rn-1 n+14n2 cm-1

Subtopic:  Hydrogen Spectra |
 68%
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The correct Schrodinger's wave equation for a electron with total energy E and potential energy V is given by

1.  2ψx2+2ψy2+2ψz2+8π2mh2E-V ψ=0

2.  2ψx2+2ψy2+2ψz2+8πmh2E-V ψ=0

3.  2ψx2+2ψy2+2ψz2+8π2mh2E-V ψ=0

4.  None of the above.

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 59%
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If the uncertainty in position and momentum are equivalent, what is the corresponding uncertainty in velocity?

1. 12mhπ 2. h2π
3. 1mhπ 4. hπ
Subtopic:  Heisenberg Uncertainty Principle |
 81%
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NEET - 2008
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Which one of the following ions has electronic configuration [Ar]3d6?

(At. no: Mn = 25, Fe = 26, Co = 27, Ni =28)

(1) Ni3+               

(2) Mn3+

(3) Fe3+               

(4) Co3+

Subtopic:  AUFBAU Principle |
 81%
From NCERT
NEET - 2010
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Maximum number of electrons in a subshell 4f is

(1) 14
(2) 16
(3) 10
(4) 12

 

Subtopic:  Shell & Subshell |
 85%
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What is the maximum numbers of electrons that can be associated with the following set of quantum numbers?

n=3, l = 1 and m=-1

(1) 10
(2) 6
(3) 4
(4) 2

 

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 73%
From NCERT
NEET - 2013
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Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?

(1) 3s 4s 3p 3d                   

(2) 4s 3s 3p 3d

(3) 3s 3p 3d 4s                   

(4) 3s 3p 4s 3d

Subtopic:  AUFBAU Principle |
 82%
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