1. \(2000~\mathring{A}\)
2. \(4000~\mathring{A}\)
3. \(4500~\mathring{A}\)
4. \(9000~\mathring{A}\)
1. | \(5\rightarrow 4\) | 2. | \(3\rightarrow 2\) |
3. | \(2\rightarrow 1\) | 4. | \(3\rightarrow 1\) |
1. | 2. | ||
3. | 4. |
1. | \(145\) | 2. | \(160\) |
3. | \(172\) | 4. | \(157\) |
The de-Broglie wavelength of an electron in the second orbit of a hydrogen atom is equal to:
1. | The perimeter of the orbit. |
2. | The half of the perimeter of the orbit. |
3. | The half of the diameter of the orbit. |
4. | The diameter of the orbit. |
What is the ratio of the speed of an electron in the first orbit of an \(\mathrm{H}\text-\)atom to the speed of light?
1. | \(\dfrac{1}{137}\) | 2. | \(137\) |
3. | \(\dfrac{1}{83}\) | 4. | \(\dfrac{1}{47}\) |
What happens when an electron makes a transition from an excited state to the ground state of a hydrogen-like atom or ion?
1. | Its kinetic energy increases but potential energy and total energy decrease. |
2. | Kinetic energy, potential energy and total energy decrease. |
3. | Kinetic energy decreases, potential energy increases but the total energy remains the same. |
4. | Kinetic energy and total energy decrease but potential energy increases. |
The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion.
What is the atomic number \(Z\) of hydrogen like ion?
1. \(4\)
2. \(1\)
3. \(2\)
4. \(3\)