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Q. No.A \(5~\text W\) emits monochromatic light of wavelength \(5000~\mathring{A}.\) When placed \(0.5~\text m\) away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved \(1.0~\text m\) away, the number of photoelectrons liberated is reduced by a factor of:
1. \(4\)
2. \(8\)
3. \(16\)
4. \(2\)
Subtopic: Â Electron Emission |
 72%
From NCERT
AIPMT - 2007
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A photocell is receiving light from a source placed at a distance of \(1\) m. If the same source is placed at a distance of \(2\) m, then the ejected electron:
| 1. | moves with one-fourth of energy as that of the initial energy. |
| 2. | moves with one-fourth of momentum as that of the initial momentum. |
| 3. | will be half in number. |
| 4. | will be one-fourth in number. |
Subtopic: Â Electron Emission |
 68%
From NCERT
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Consider a beam of electrons (each electron with energy \(E_0\)) incident on a metal surface kept in an evacuated chamber. Then:
| 1. | no electrons will be emitted as only photons can emit electrons. |
| 2. | electrons can be emitted but all with energy, \(E_0.\) |
| 3. | electrons can be emitted with any energy, with a maximum of \({E}_0-\phi\) (\(\phi\) is the work function). |
| 4. | electrons can be emitted with any energy, with a maximum \(E_0.\) |
Subtopic: Â Electron Emission |
From NCERT
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