# 2 ×108 atoms of carbon are arranged side by side. The radius of a carbon atom if the length of this arrangement is 2.4 cm would be  1. 7.0 x 10-11 m 2. 5.0 x 10-11 m 3. 8.0 x 10-11 m 4. 6.0 x 10-11 m

Subtopic:  Introduction of Atomic Structure |
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The diameter of a zinc atom is 2.6 Å. If zinc atoms are arranged side by side lengthwise, number of atoms present in a length of 1.6 cm would be:
1.  5.153 x 107
2.  6.153 x 107
3.  4.153 x 109
4.  6.153 x 103

Subtopic:  Introduction of Atomic Structure |
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A certain particle carries 2.5 × 10–16 C of static electric charge. The number of electrons present in it would be

1. 1460

2. 1350

3. 1560

4. 1660

Subtopic:  Introduction of Atomic Structure |
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In Rutherford's experiment, generally, the thin foil of heavy atoms like gold, platinum, etc. have been used to be bombarded by the α-particles. If the thin foil of light atoms like aluminum etc. is used in Rutherford’s experiment, the difference that would be observed from the above results is :

1. The same results will be observed

2. More deflection would be observed

3. There will not be enough deflection

4. None of the above

Subtopic:  Introduction of Atomic Structure |
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Symbols ${}_{35}{}^{79}\mathrm{Br}$ and ${}^{79}Br$ can be written,
whereas symbols ${}_{79}{}^{35}\mathrm{Br}$ and ${}^{35}Br$ are not acceptable because
1. The general convention for representing an element along with its atomic number (A) and atomic mass (Z) is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$
2. The general convention for representing an element along with its atomic mass (A) and atomic number (Z) is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$

3. The general convention for representing an element along with its wavelength (A) and frequency (Z) is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$
4. The general convention for representing an element along with its isotopes (A) and atomic number (Z) is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$

Subtopic:  Introduction of Atomic Structure |
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The correct arrangement of the following electromagnetic spectrum in the increasing order of frequency is
1. Cosmic rays < Amber light < Radiation of FM radio < X-rays < Radiation from microwave ovens
2. Radiation from FM radio  < Radiation from microwave oven < Amber light < X- rays < Cosmic rays
3. Radiation from microwave ovens < Amber light < Radiation of FM radio < X-rays < Cosmic rays
4. Cosmic rays < X-rays < Radiation from microwave ovens < Amber light < Radiation of FM radio

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The work function for the Cesium atom is 1.9 eV. The threshold frequency of the radiation is

1. 4.59 × 1014 ${\mathrm{s}}^{-1}$

2. 8.59 × 1014 ${\mathrm{s}}^{-1}$

3. 5.59 × 10-14 ${\mathrm{s}}^{-1}$

4. 65.9 × 1014 ${\mathrm{s}}^{-1}$

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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