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Q. No.Given below are two statements:
| Assertion (A): | The absorption line observed in the spectra of an element is never completely dark. |
| Reason (R): | The sample used for absorption is thin, so that all photons corresponding to a transition may not be absorbed. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Spectral Series |
From NCERT
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Among the given options which is the minimum work function so that light from the Balmer series will not be able to cause any photo-electric effect?
| 1. | \(13.6~\text{eV}\) |
| 2. | \(\dfrac{13.6} {2}~\text{eV}\) |
| 3. | \(13.6×\left(\dfrac{3}{4}\right)~\text{eV}\) |
| 4. | \(13.6×\left(\dfrac14-\dfrac19\right)~\text{eV}\) |
Subtopic: Spectral Series |
From NCERT
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In stimulated emission, an incoming photon interacts with an excited atom (e.g. \(\mathrm{H}^{*}\)) and brings the atom to its ground state, while an extra photon is emitted - as it happens in a laser. When a photon stimulates the emission of another photon, the two photons have:
| 1. | the same phase. |
| 2. | the same energy. |
| 3. | the same direction. |
| 4. | the same phase, energy, and direction. |
Subtopic: Spectral Series |
51%
From NCERT
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A set of atoms in an excited state decays:
| 1. | in general to any of the states with lower energy. |
| 2. | into a lower state only when excited by an external electric field. |
| 3. | all together simultaneously into a lower state. |
| 4. | to emit photons only when they collide. |
Subtopic: Spectral Series |
55%
From NCERT
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In a muonic atom, a muon of mass of \(200\) times of that of an electron, and the same charge is bound to the proton. The wavelengths of its Balmer series are in the range of:
1. \(X\text-\text{rays}\)
2. infrared
3. \(\gamma\text-\text{rays}\)
4. microwave
1. \(X\text-\text{rays}\)
2. infrared
3. \(\gamma\text-\text{rays}\)
4. microwave
Subtopic: Spectral Series |
62%
From NCERT
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