Q. No.The graph that shows the variation of the de-Broglie wavelength \((\lambda)\) of a particle and its associated momentum \((p)\) is:
1.
2.
3.
4.
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2. | |
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4. | |
The de-Broglie wavelength of the thermal electron at \(27^\circ \text{C}\) is \(\lambda.\) When the temperature is increased to \(927^\circ \text{C},\) its de-Broglie wavelength will become:
| 1. | \(2\lambda\) | 2. | \(4\lambda\) |
| 3. | \(\dfrac\lambda2\) | 4. | \(\dfrac\lambda4\) |
In a photoelectric experiment, blue light is capable of ejecting a photoelectron from a specific metal while green light is not able to eject a photoelectron. Ejection of photoelectrons is also possible using light of the colour:
| 1. | yellow | 2. | red |
| 3. | violet | 4. | orange |
| 1. | \(2~\text{eV}\) | 2. | \(2~\text{V}\) |
| 3. | \(1.1~\text{V}\) | 4. | \(6.4~\text{V}\) |
| 1. | \(h\nu_0\) | 2. | \(2h\nu_0\) |
| 3. | \(3h\nu_0\) | 4. | \(4h\nu_0\) |
| 1. | \(\dfrac{3}{2} \nu\) | 2. | \(2\nu\) |
| 3. | \(3\nu\) | 4. | \(\dfrac{2}{3} \nu\) |
| 1. | \(\mathrm{Na}\) only | 2. | \(\mathrm{Cs}\) only |
| 3. | both \(\mathrm{Na}\) and \(\mathrm{K}\) | 4. | \(\mathrm{K}\) only |
1. \(13.6\) nm
2. \(136\) nm
3. \(1.36\) nm
4. \(0.136\) nm
The maximum kinetic energy of the emitted photoelectrons in the photoelectric effect is independent of the:
| 1. | work function of material |
| 2. | intensity of incident radiation |
| 3. | frequency of incident radiation |
| 4. | wavelength of incident radiation |
An electromagnetic wave of wavelength \(\lambda\) is incident on a photosensitive surface of negligible work function. If '\(m\)' is the mass of photoelectron emitted from the surface and \(\lambda_d\) is the de-Broglie wavelength, then:
| 1. | \( \lambda=\left(\dfrac{2 {mc}}{{h}}\right) \lambda_{{d}}^2 \) | 2. | \( \lambda=\left(\dfrac{2 {h}}{{mc}}\right) \lambda_{{d}}^2 \) |
| 3. | \( \lambda=\left(\dfrac{2 {m}}{{hc}}\right) \lambda_{{d}}^2\) | 4. | \( \lambda_{{d}}=\left(\dfrac{2 {mc}}{{h}}\right) \lambda^2 \) |
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