# The work function for the Cesium atom is $$1.9~\mathrm{eV}.$$ The threshold frequency of the radiation is: 1. $$4.59 \times10^{14}~s^{-1}$$ 2. $$8.59 \times10^{14}~s^{-1}$$ 3. $$5.59 \times10^{-14}~s^{-1}$$ 4. $$65.9 \times10^{14}~s^{-1}$$

Subtopic:  Photo Electric Effect |
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When a photon with a wavelength of 150 pm strikes an atom, one of its inner bound electrons is ejected at a velocity of 1.5 × 107 m s–1 The energy with which it is bound to the nucleus would be:

1. 32.22 × 10–16 J

2. 12.22 × 10–16 J

3. 22.27 × 10–16 J

4. 31.22 × 10–16 J

Subtopic:  Photo Electric Effect |
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If the position of the electron were measured with an accuracy of +0.002 nm, the uncertainty in the momentum of the electron would be:

1. 5.637 × 10–23 kg m s–1

2. 4.637 × 10–23 kg m s–1

3. 2.637 × 10–23 kg m s–1

4. 3.637 × 10–23 kg m s–1

Subtopic:  Heisenberg Uncertainty Principle |
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The electron of a Br atom that experiences the lowest effective nuclear charge is:

1. 2p and 3p

2. 4p

3. 2p

4. 3p

Subtopic:  Number of Electron, Proton & Neutron |
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The unpaired electrons in Al and Si are present in the 3p orbital. The electrons that will experience a more effective nuclear charge from the nucleus are :

1. Electrons in the 3p orbital of silicon

2. Electrons in the 5d orbital of aluminium

3. Electrons in the 3p orbital of aluminium

4. Electrons in the 5p orbital of silicon

Subtopic:  Number of Electron, Proton & Neutron |
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Identify the element with the highest number of unpaired electrons in its ground state from the given options :

 1 P 2 Fe 3 Kr 4 Cr
Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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The number of electrons that can be present in the subshells having ms value of $$-\frac{1}{2}$$ for n = 4 are:

1. 36

2. 4

3. 16

4. 2

Subtopic:  Shell & Subshell |
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The atomic number of elements whose outermost electronic configuration are represented by 3s1 and 2p5 respectively, is:

 1 9, 7 2 9, 11 3 11, 5 4 11, 9

Subtopic:  Introduction of Atomic Structure |
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The circumference of the Bohr orbit for the H atom is related to the de Broglie wavelength associated with the electron revolving around the orbit by the following relation:
1. $2\mathrm{\pi r}=\mathrm{n\lambda }$
2. $\mathrm{\pi r}$ $=$ $2\mathrm{n\lambda }$
3. $\mathrm{mvr}$ $=$ $\mathrm{n\lambda }$
4. $\mathrm{vr}$ $=$ $2\mathrm{n\lambda }$

Subtopic:  Bohr's Theory | De Broglie Equation |
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Which among the following are isoelectronic species?

1.

2.

3.

4. None of the above

Subtopic:  Number of Electron, Proton & Neutron |
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