Q. No.1. \(\frac{e}{\sqrt{4\pi m\varepsilon_0 r}}\)
2. \(\frac{2e}{\sqrt{\pi m\varepsilon_0 r}}\)
3. \(\frac{e}{\sqrt{\pi m\varepsilon_0 r}}\)
4. \(\frac{e}{4\pi m\varepsilon_0 r}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMaximum frequency of emission is obtained for the transition:
1. n = 2 to n = 1
2. n = 6 to n = 2
3. n = 1 to n = 2
4. n = 2 to n = 6
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe life span of atomic hydrogen is:
1. Fraction of one sec
2. One year
3. One hour
4. One day
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | the first line of the Lyman series. |
| 2. | the second line of the Balmer series. |
| 3. | the first line of the Paschen series. |
| 4. | the second line of the Paschen series. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | \(4E_n\) | 2. | \(\dfrac{E_n}{4}\) |
| 3. | \(2E_n\) | 4. | \(\dfrac{E_n}{2}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. \(K \frac{e^{2}}{r^{2}} \hat{r}\)
2. \(- K \frac{e^{2}}{r^{3}} \hat{r}\)
3. \(K \frac{e^{2}}{r^{3}} \overset{\rightarrow}{r}\)
4. \(- K \frac{e^{2}}{r^{3}} \overset{\rightarrow}{r}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn which of the following systems will the radius of the first orbit (\(n=1\)) be minimum:
1. doubly ionized lithium
2. singly ionized helium
3. deuterium atom
4. hydrogen atom
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyEnergy \(E\) of a hydrogen atom with principal quantum number \(n\) is given by \(E=-\frac{13.6}{n^{2}}~\text{eV}.\) The energy of a photon ejected when the electron jumps from \(n=3\) state to \(n=2\) state of hydrogen is approximately:
1. \(0.85~\text{eV}\)
2. \(3.4~\text{eV}\)
3. \(1.9~\text{eV}\)
4. \(1.5~\text{eV}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | uses Einstein's photoelectric equation. |
| 2. | predicts continuous emission spectra for atoms. |
| 3. | predicts the same emission spectra for all types of atoms. |
| 4. | assumes that the angular momentum of electrons is quantized. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe total energy of an electron in the first excited state of a hydrogen atom is about \(-3.4\) eV.
Its kinetic energy in this state will be:
1. \(-6.8~\text{eV}\)
2. \(3.4~\text{eV}\)
3. \(6.8~\text{eV}\)
4. \(-3.4~\text{eV}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
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