- 1(current)
Q. No.A 5 W emits monochromatic light of wavelength 5000 Å. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved 1.0 m away, the number of photoelectrons liberated is reduced by a factor of?
1. 4
2. 8
3.16
4. 2
Subtopic: Electron Emission |
71%
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: Electron Emission |
65%
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 \(\mathrm{E}_0-\phi\) (\(\phi\) is the work function). |
| 4. | electrons can be emitted with any energy, with a maximum \(E_0\). |
Subtopic: Electron Emission |
From NCERT
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