Which of the following sets of quantum numbers is possible :
1. n = 0, l = 0, ml = 0, ms = + ½
2. n = 1, l = 0, ml = 0, ms = – ½
3. n = 1, l = 1, ml = 0, ms = + ½
4. n = 3, l = 3, ml = –3, ms = + ½
The total number of electrons in an atom with the following quantum numbers would be
(a) n = 4, ms = – ½
(b) n = 3, l = 0
1. 16, 2
2. 11, 8
3. 16, 8
4. 12, 7
The transition in the hydrogen spectrum that would have the same wavelength as Balmer transition from n = 4 to n = 2 of He+ spectrum is :
1.
2. = 3 to n1 = 2
3. = 3 to n1 = 1
4. = 2 to n1 = 1
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 × 10–11 m
2. 5.0 × 10–11 m
3. 8.0 × 10–11 m
4. 6.0 × 10–11 m
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 × 107
2. 6.153 × 107
3. 4.153 × 109
4. 6.153 × 103
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 |
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.
Symbols and can be written,
whereas symbols and are not acceptable because:
1. | The general convention for representing an element along with its atomic number (A) and atomic mass (Z) is |
2. | The general convention for representing an element along with its atomic mass (A) and atomic number (Z) is |
3. | The general convention for representing an element along with its wavelength (A) and frequency (Z) is |
4. | The general convention for representing an element along with its isotopes (A) and atomic number (Z) is |
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 |
The work function of the Cesium atom is \(1.9~\mathrm{eV}.\) What is the threshold frequency of radiation for this atom?
1. | \(4.59 \times10^{14}~s^{-1}\) | 2. | \(8.59 \times10^{14}~s^{-1}\) |
3. | \(5.59 \times10^{-14}~s^{-1}\) | 4. | \(65.9 \times10^{14}~s^{-1}\) |